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WAYNE CDU790 - 1/3 HP Submersible Cast Iron and Stainless Steel Sump Pump with Integrated Vertical Float Switch - Up to 4,600 Gallons Per Hour - Heavy Duty Basement Sump Pump, Black

4.7 4.7 out of 5 stars 1,944 ratings
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Amazon's Choice in Sump Pumps by Wayne
$146.48 with 6 percent savings
Typical price: $156.40

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Purchase options and add-ons

Brand Wayne
Color Black
Material Cast Iron
Style Pump
Product Dimensions 10.5"L x 9"W x 11"H
Power Source Corded Electric
Item Weight 16 Pounds
Maximum Flow Rate 63 Gallons Per Minute
Maximum Lifting Height 10 Feet
Voltage 120 Volts

About this item

  • Indoor Use Only - This 1/3 HP WAYNE basement sump pump is perfect to keep your basement dry during heavy water flow. Whether it’s rain, snow melting, etc. WAYNE model CDU790 can pump up to 4,600 GPH to keep your basement dry.
  • Tough And Durable - Corrosion-resistant epoxy coated steel motor housing and stainless steel fasteners come with a cast-iron volute that provides long life in tough sump pump applications.
  • Efficient Design - The top suction design eliminates air lock and minimizes clogging from any debris in the bottom of the sump pit. Easy to install in about 15 minutes with no need to drill a weep hole!
  • Additional Features - 1-1/2” NPT discharge for compliance with building codes. The vertical float switch has been tested to 1 million cycles for long-lasting use, up to 10 time more than our competitors.
  • Quality You Deserve - Proudly assembled in the USA for quality you can trust. Warrantied for 3 years for dependable, efficient, & ultra-quiet performance.
› See more product details

Customer ratings by feature

Easy to install
4.7 4.7
Noise level
4.6 4.6
Value for money
4.5 4.5
See all reviews

Customers usually keep this item

This product has fewer returns than average compared to similar products.

Frequently bought together

WAYNE CDU790 - 1/3 HP Submersible Cast Iron and Stainless Steel Sump Pump with Integrated Vertical Float Switch - Up to 4,600
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Get it as soon as Thursday, May 2
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From the manufacturer

Wayne Submersible Sump Pump
CDU790 Sump Pump
CDU790 Sump Pump
Protect your basement!
1/3 HP Epoxy Coated and Cast Iron Submersible Sump Pump 1/2 HP Epoxy Coated and Reinforced Thermoplastic Submersible Sump Pump 1/2 HP Epoxy Coated and Cast Iron Submersible Sump Pump /2 HP Sump Pump with Integrated Vertical Float Switch and 12 Volt Battery Back Up Upgraded 12-Volt Battery Backup System
1/3 HP Epoxy Coated and Cast Iron Submersible Sump Pump 1/2 HP Epoxy Coated and Reinforced Thermoplastic Submersible Sump Pump 1/2 HP Epoxy Coated and Cast Iron Submersible Sump Pump Basement Back Up 1/2 HP & 12 Volt Combination System 12 Volt Battery Back Up Sump Pump
Customer Reviews
4.7 out of 5 stars
1,944
4.3 out of 5 stars
159
4.3 out of 5 stars
46
4.6 out of 5 stars
1,733
4.6 out of 5 stars
1,733
Price $146.48 $143.37 $181.36 $510.47 $339.99
HP 1/3 1/2, 1/3 1/2 1/2 12 VDC
Flow Rate At 0' 4600 Gal/Hr 1/2 HP: 4300 Gal/Hr, 1/3 HP: 3750 Gal/Hr 5100 Gal/Hr 5100 Gal/Hr 2700 Gal/Hr
Sump Pump Basin Size Requirement 11 in. diameter 11 in. diameter 14 in. diameter 16 in. diameter 14 in. diameter
Corrosion Resistant ✓ ✓ ✓ ✓ ✓
Top Suction Design ✓ ✓ ✓ ✓ ✓
Submersible ✓ ✓ ✓ ✓
Easy Installation ✓ ✓ ✓ ✓ ✓
Back-Up Ready ✓ ✓

Product information

Technical Details

Additional Information

Warranty & Support

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Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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WAYNE CDU790 - 1/3 HP Submersible Cast Iron and Stainless Steel Sump Pump with Integrated Vertical Float Switch - Up to 4,600 Gallons Per Hour - Heavy Duty Basement Sump Pump, Black

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Product guides and documents

Installation Manual (PDF)
User Manual (PDF)

Product Description

Product Description

1/3 hp cast iron submersible sump pump with vertical switch pumps up to 4600 gph at 0' designed for 11 inch diameter or larger sump basin top suction design filters debris and minimizes clogging designed for easy installation without any Plumbing changes epoxy coated steel high performance 1/3 hp motor 1-1/2 inch NPT discharge & durable cast iron base easy carry handle for portability float guard protects switch from hang ups Easy installation and easy handling.

From the Manufacturer

The Wayne CDU790 features durable cast iron housing for long life and quiet operation. This submersible pump is compactly designed for 11" or larger sump pits. The CDU series is one of the most popular replacement pumps in America. The ceramic mechanical seal assures long life in the most demanding applications and the 1 1/2" discharge allows easy installation plus maximum flow. Similar applications to the following brands of submersible sump pumps , Craftsman, Zoeller, Flotec, Water Ace, Myers, Little Giant, Liberty, Pit Viper, Ridgid, Blue Angel, Sta-Rite, Starite, Diamond, Star, Flint and Walling, Coleman, Maytag, Jacuzzi, ShurDri, Shur-dri, GSW, Teel, Master Plumber, UL listed. Intended for indoor use only.

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WAYNE CDU790 - 1/3 HP Submersible Cast Iron and Stainless Steel Sump Pump with Integrated Vertical Float Switch - Up to 4,600 Gallons Per Hour - Heavy Duty Basement Sump Pump, Black
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Details
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Price-6% $146.48
Typical: $156.40		$169.99$189.99$89.99$149.99
Delivery
Get it as soon as Thursday, May 2
Get it as soon as Thursday, May 2
Get it May 2 - 6
Get it as soon as Friday, May 3
Get it as soon as Thursday, May 2
Customer Ratings
4.74.7 out of 5 stars1,944
4.44.4 out of 5 stars5,687
4.84.8 out of 5 stars26
4.34.3 out of 5 stars382
4.44.4 out of 5 stars341
Noise level
4.6
4.3
—
4.3
4.1
Value for money
4.5
3.9
—
3.5
3.9
Easy to install
4.7
4.3
—
4.5
—
Suction power
—
4.0
—
4.8
4.2
Sold By
Amazon.com
Gulin
Westinghouse Residential Pumps
Vansen Tools
Tornado Tools
power source
Corded Electric
Corded Electric
Corded Electric
Corded Electric
ac
material
Cast Iron
Stainless Steel, Cast Iron
Cast Iron, Stainless Steel
Plastic
Stainless Steel
style
Pump
Stainless steel 3/4HP
1/2 HP Sump Pump
1/3 HP 3040GPH
With Tethered Floater
maximum flow rate
63 gallons per minute
76.66 gallons per minute
87 gallons per minute
50.67 gallons per minute
100 gallons per minute
weight
16 pounds
9.06 kilograms
—
4.6 kilograms
16.6 pounds

Important information

Indications

See owners manual

Directions

See owners manual

Bulb Voltage

120 volts

Customer reviews

4.7 out of 5 stars
4.7 out of 5
1,944 global ratings

Customers say

Customers like the performance, quality and noise of the water pump. For example, they mention it works well, is reliable and has heavy duty construction. They appreciate the super quiet operation and the ease of installation. Customers are also impressed with the value, speed and compactness.

AI-generated from the text of customer reviews

214 customers mention195 positive19 negative

Customers are satisfied with the performance of the water pump. They mention that it works well, has no issues, and the float switch works as it should. The design is simple but brilliantly at the same time, and it draws water from the sides, not the bottom. It is quiet, efficient, and shows no signs of slowing down.

"Wow! Great product, easy to install, works great so far." Read more

"Easy to hook up and does it’s job. Really quiet compared to the old one it replaced." Read more

"...I have already tested it and it works like a charm...." Read more

"...Quiet running. Emptied the pit with in 15 seconds. Float switch works as it should. Been using this brand for quite a few years, never had a problem!" Read more

199 customers mention168 positive31 negative

Customers like the quality of the water pump. They say it's a heavy duty construction, very reliable, and has held up really well. Customers also appreciate the incredible engineering and manufacturing, and the durable materials used. They even say it is a solid sump pump with a 3 year warranty.

"Wow! Great product, easy to install, works great so far." Read more

"...This is a solid sump pump with a 3 year warranty. I registered it online immediately and am confident it will outlast my old pumps by far...." Read more

"...The pump is the best that I have ever used compared to the Home Depot and Lowe's versions which are more expensive and tend to break down by 2 years..." Read more

"...What a little waterproof tank this thing is. Incredible engineering and manufacturing." Read more

127 customers mention123 positive4 negative

Customers are satisfied with the noise level of the water pump. They mention that it is super quiet and removes water quickly without the gargling.

"Easy to hook up and does it’s job. Really quiet compared to the old one it replaced." Read more

"...The installation was very easy, and the operation is so quiet that I was worried that it wasn't working...." Read more

"Easy installation. Quiet running. Emptied the pit with in 15 seconds. Float switch works as it should...." Read more

"...The pump is relatively quiet and I like that the intake is on the side rather than the bottom...." Read more

112 customers mention109 positive3 negative

Customers find the installation of the water pump to be straightforward, fast, and easy. They also mention it's trouble-free and an easy DIY project.

"Wow! Great product, easy to install, works great so far." Read more

"Easy to hook up and does it’s job. Really quiet compared to the old one it replaced." Read more

"...It has a long cable for reaching the outlet.The installation was very easy, and the operation is so quiet that I was worried that it was..." Read more

"Easy installation. Quiet running. Emptied the pit with in 15 seconds. Float switch works as it should...." Read more

52 customers mention52 positive0 negative

Customers find the water pump to be the best value for the money. They say it's affordable, and easy to compare prices online.

"...For all of that, I give it 5 stars. Also for a super value and price as well as terrific quality." Read more

"...It is well made and the price was good. I never had an issue after I installed it so when my backup pump died. I naturally bought a second one...." Read more

"...This one is working perfectly and is way lower price than anything you find in a hardware store." Read more

"Outstanding price….. Best feature, draws water from the sides, not bottom of pump, greatly eliminating drawing up sediment from bottom , eliminating..." Read more

19 customers mention19 positive0 negative

Customers are satisfied with the speed of the water pump. They mention that it empties the sump very fast, it is extremely quiet, and it clears out water quickly. Some say that it is easy to install and that it removes water quickly without the gargling.

"...The Wayne pumps water MUCH faster than the old pumps I bought. The sump empties in a matter of only a few seconds...." Read more

"Great pump easy to install, drains the basin quickly and quietly." Read more

"The pump was easy to install, it is extremely quiet and pumps water out very quickly. much quieter than the one it replaced." Read more

"We use this to transfer water from 55 gallon drums. Will empty a drum quickly." Read more

15 customers mention15 positive0 negative

Customers like the compactness of the water pump. They mention that it works great, is small enough to fit in a 5 gallon bucket, and is good size for an average basement sump pump. Some say that it takes up little space in their pit and that it fits perfectly with the existing hardware.

"...The original plumbing and check valve were a perfect fit.The pump appears to be extremely durable. I expect it to last MANY years!..." Read more

"...it fit in the sump 2) it is very very very quiet...." Read more

"...My home is fairly modern so this small pump fit the existing hardware perfectly. I don't know about older homes...." Read more

"...Much more compact. Pumped water out at least 20x faster (and I believe it is less HP)...." Read more

13 customers mention13 positive0 negative

Customers like the appearance of the water pump. They say it has a better float design, a great float valve design, and a simple but brilliantly designed float. Some say it's quieter than the Zoeller and that they love the guarded float attachment.

"...It weighs 2-3 times what the pump it replaced. The float on this is designed very simple but brilliantly at the same time...." Read more

"...This pump also is about 90% more quiet also. Also this pump has a vertical float which is important when using submersible...." Read more

"CSU790 1/3 HP. Nice and quiet, installation was easy. The 1&1/2” NTP discharge connector is great, makes buying the PVC nice and easy...." Read more

"...Really nice float attachment that wont get stuck on the sides like the old one did." Read more

Excellent value for the cost
5 Stars
Excellent value for the cost
We have going on 50 feet of B-Dry'd wall in our basement and for 20+ years it had been bone dry. Suddenly got wet in our latest storm and I found our old sump pump had finally died. Ordered this one, delivered in one day, and took 10 minutes to swap out. The original plumbing and check valve were a perfect fit.The pump appears to be extremely durable. I expect it to last MANY years! I have a number of Wayne pumps and love them all. Built like tanks!
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Top reviews from the United States

Darren Pritchard
5.0 out of 5 stars Simple to install
Reviewed in the United States on March 6, 2024
Style: PumpVerified Purchase
Wow! Great product, easy to install, works great so far.
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KD
5.0 out of 5 stars Works great and quiet
Reviewed in the United States on March 12, 2024
Style: PumpVerified Purchase
Easy to hook up and does it’s job. Really quiet compared to the old one it replaced.
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Repro63
5.0 out of 5 stars Best Sump Pump I ever had
Reviewed in the United States on February 25, 2022
Style: PumpVerified Purchase
We have two sump pumps in our basement to keep it nice and dry. Every 4 years or so, even less, we have to replace one. I have been buying the same brand every time and thought there has to be something better.

I have read how good the Wayne sump pumps are and decided to try one out. I got the model WAYNE CDU790 and it is absolutely great. Right away out of the box you can feel is it quality. The old ones I bought were thermoplastic and only one lasted the expected 5 years. Some lasted a little over 4 years, most did not. The cast iron is heavy duty with stainless steel hardware holding it all together. The impeller is also stainless steel protected by a cast iron shroud. It has a long cable for reaching the outlet.

The installation was very easy, and the operation is so quiet that I was worried that it wasn't working. I had to remove the cover to see if it was working and it is. My old pumps were so loud you could hear them upstairs every time they ran. The Wayne pumps water MUCH faster than the old pumps I bought. The sump empties in a matter of only a few seconds.

This is a solid sump pump with a 3 year warranty. I registered it online immediately and am confident it will outlast my old pumps by far. The expected life if 6 years. For all of that, I give it 5 stars. Also for a super value and price as well as terrific quality.
9 people found this helpful
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Ken Morris
4.0 out of 5 stars Almost Perfect Pump-Needs MacGyvering for Longevity
Reviewed in the United States on January 6, 2024
Style: PumpVerified Purchase
I use the pump in my crawl space where I get a ton of ground water especially after rains. The pump is the best that I have ever used compared to the Home Depot and Lowe's versions which are more expensive and tend to break down by 2 years. My previous Wayne CDU790 lasted 44 months (beyond the 3 year warranty) which is my best experience to date. If not for a really cheap flaw with the float kit, I believe it would have lasted even longer. Unfortunately, on several occasions the float shaft which has a small mushroom end on the bottom worked its way through the rubber phlange at the bottom of the pump that holds the float in place. This in effect does not allow the float to trigger the engagement switch off when the water drains (because the float now sits sideways). When a pump runs continuously dry, this is not good for a pump. The first (3) times it happened, I caught it in time and reinserted the mushroom ending through the phlange until it happened again. The last and final time, I was on vacation and it rained and the same thing happened and it ran dry for too long and the pump broke down. Now, I really like the pump and for about $1.50 and being handy, you can prevent the same thing from happening. I wish that the makers of Wayne Pumps would do the same thing. Essentially, I MacGyvered a solution. I bought a nylon cover plate to an electrical outlet box and drilled a 1 inch disc off of the plate. I drilled a 5/32" hole through the disk. I disengaged the float and shaft, which is easy, but re-engaging is more difficult. I slide the nylon disk on to the shaft against the mushroom end then slid the shaft through the rubber phlange. In order to put the free moving float back on, I had to temporarily bend the other end of the shaft straight. After doing so, the float was slid on and the shaft was run through the switch. With a couple of pairs of vice grips, I rebent the shaft so that it would stay engaged with the switch. I have already tested it and it works like a charm. Reference Part 60038-WYN1 for the float kit which can be purchased separately on Amazon in case you have a need.
4 people found this helpful
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Sara
5.0 out of 5 stars DURABLE AND CAPABLE
Reviewed in the United States on February 18, 2024
Style: PumpVerified Purchase
The media could not be loaded.
 Never thought I’d ever be compelled to leave a review for a sump pump, but alas, here I am doing just that. After sitting totally submerged in water (like FULLY under water) for two weeks because I forgot to plug it in before a big rain, I plugged it in expecting nothing to happen because surely it was water logged and damaged from sitting in water for two weeks, but within a few seconds, the thing was pumping gallons of water out of our basement. I was blown away. Mind you, I’ve already had this thing sitting in a dirty hole, pumping dirty water intermittently for two years. What a little waterproof tank this thing is. Incredible engineering and manufacturing.
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Wayne Rozman
5.0 out of 5 stars Great sump pump for your money
Reviewed in the United States on December 13, 2023
Style: PumpVerified Purchase
Easy installation. Quiet running. Emptied the pit with in 15 seconds. Float switch works as it should. Been using this brand for quite a few years, never had a problem!
4 people found this helpful
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Kevin H.
5.0 out of 5 stars works well; tough getting adapter to fit straight but it did (hint: push down while turning)
Reviewed in the United States on October 12, 2022
Style: PumpVerified Purchase
Overall recommended based on first day installation and operation. The pump is relatively quiet and I like that the intake is on the side rather than the bottom. My previous pump lasted about 13 years without any problems and with zero maintenance. I hope I will get the same type of service out of this one.

The manual says I have to change the switch every two years which I won't do. Why not make the switch last for the life of the pump and charge me $15 more or $50 more? Change the switch? No. I'll change the entire pump when it stops working, and if that happens earlier than 10 years, I'll downgrade to 2 or 3 stars.

The old 1-1/2 inch PVC adapter did not go on easily and would get crooked after a full turn. The trick I learned was to push down with some force on the pipe/adapter while turning which helped get in about 3 full rotations by hand. I had bought a few different adapters thinking the old adapter on the old sump pump didn't fit. All the new adapters had trouble going on at first but eventually would go on a few rotations by hand when I pressing down while turning. The threads on the pump are a little tight from the factory is all.
2 people found this helpful
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PaulStLMo
5.0 out of 5 stars Nice pump.
Reviewed in the United States on February 20, 2024
Style: PumpVerified Purchase
This seems a nice pump. Higher quality than I was expecting and probably much higher quality than the pump I replaced. I'm guessing the design of these pumps is standardized even among manufacturers (outlet pipe size and position, float water depth range, etc...), which made my installation very easy.
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Top reviews from other countries

Amazon Customer
5.0 out of 5 stars Works very good and quite as well
Reviewed in Canada on September 15, 2022
Style: PumpVerified Purchase
Nice and quiet ! Unit is as described. Would be nice if you could control the limit switch so the pump could turn on sooner in order to keep the water level lower. I used a piece of 2"long x 1/2" dia. rubber hose on the float and solved my issue. Pump runs more often for shorter periods. After a couple heavy rains the pump worked excellent .
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Lisette and Ron
5.0 out of 5 stars Great Pump!
Reviewed in Canada on March 28, 2018
Style: PumpVerified Purchase
Received the product quickly. Well packed. The pump is heavy and appears to be of the high quality expected from Wayne. Easy to install. The pump has a top handle so that makes it easy to raise and lower during installation. Another thing I like is there is a guard to protect the float from touching the side of the sump wall. The pump starts with about 9" of water in the well and shuts off with about 5" remaining (about a 4" cycle). My sump is 24" X 18" and it completes the cycle in about 6 seconds, That's about 1 US gal/sec.. The inlet holes are up from the bottom. I like this because it prevents air locking and also prevents any debris from getting into the impeller. I have it piped with 1-1/2" ABS all the way to the ditch (30') and going through a Zoeller check valve. I have about a 5' head. Last but not least the pump is very quiet! Hope this helps someone.
17 people found this helpful
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PThek
5.0 out of 5 stars Absolutely fantastic product
Reviewed in Canada on January 23, 2021
Style: PumpVerified Purchase
amazed at the quality. The cast iron body is simply sturdy and solid. It was so easy to install. Very quiet when working. I dont even notice it works. the pressure is simply too good. Love this product. 5 stars
One person found this helpful
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vDunninger
5.0 out of 5 stars Quiet, powerful and fast
Reviewed in Canada on February 20, 2020
Style: PumpVerified Purchase
Same plumbing as my previous pump so installed in 5 minutes, including unpackaging. Worked the instant I plugged it in and well water was instantly gone. Very impressed. Far better quality than that available at the big box stores and about the same price. Delivery to your door the next day is far more convenient, especially when you get a superior product.
4 people found this helpful
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Nicole Morton
4.0 out of 5 stars Look no further than the Wayne CDU790
Reviewed in Canada on March 29, 2023
Style: PumpVerified Purchase
If you're in the market for a reliable and effective sump pump, look no further than the Wayne CDU790. I recently purchased this pump for my basement, and I have been blown away by its performance and durability.
The CDU790 features a 1/3 HP motor, which is powerful enough to quickly and efficiently pump water out of your sump pit, while still being energy-efficient and cost-effective to operate. The cast iron and steel construction of the pump is incredibly sturdy and built to last, and the integrated vertical float switch makes it easy to monitor water levels and ensure that the pump is working properly.
One of the things that really sets the CDU790 apart is its quiet operation. Unlike other sump pumps that can be loud and disruptive, this pump is virtually silent, making it a great choice for homes where noise is a concern.
Overall, I am extremely satisfied with my purchase of the Wayne CDU790 sump pump. It is reliable, efficient, and built to withstand even the toughest conditions. If you want peace of mind knowing that your basement is protected from flooding, I highly recommend giving this pump a try. It's a great investment that will pay off in the long run!
2 people found this helpful
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