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Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)

4.4 4.4 out of 5 stars 1,927 ratings

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12 volts

Purchase options and add-ons


About this item

  • Continuous duty and On-demand use. Self priming and run dry safe.
  • Internal bypass technology reduces cycling.
  • 16AWG,9.4" long Leads. 13mm (1/2") MNPT threaded connections, with adaptors to 13mm hose barb
  • 2 Year Warranty
  • Meets or exceeds RoHS, SGS, and ISO standards
See more product details

Customer ratings by feature

Suction power
4.6 4.6
Easy to install
4.5 4.5
Noise level
4.2 4.2
Value for money
4.0 4.0

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This Item
Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)
SEAFLO Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)
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Added to Cart
Price$67.99$68.99$149.99$149.99$69.85
Delivery
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it Mar 22 - 26
Customer Ratings
Easy to install
4.5
4.5
4.5
3.8
4.5
Suction power
4.6
3.0
4.4
4.5
Noise level
4.2
2.5
4.0
4.2
Value for money
4.0
5.0
4.0
Sold By
MarineNow
MarineNow
GK Wholesale
MarineNow
Legendary RV Parts
power source
Solar Powered
Ac/dc
12V DC
12V DC
12V DC
material
Pump head: nylon. Pump head cover: PPS. Motor housing: polypropylene. Valves/seals: EPDM. Diaphragm: Santoprene
Polypropylene (PP)
metal
style
Diaphragm
Diaphragm
12V
Diaphragm
Above Ground
maximum flow rate
3 gallons per minute
4 gallons per minute
5 gallons per minute
5 gallons per minute
3 gallons per minute
weight
4 pounds
0.01 ounces
7 pounds
7.17 pounds
4.5 pounds

Product Description

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42 Series Water Pressure Diaphragm Pump

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  • Voltage: 12V DC
  • Flow Capacity: 3.0 GPM
  • PSI Cutoff: 55 PSI
  • Self Priming: 6 FT
  • Amp Draw: Max 7.0 A
  • Valves: Viton
  • Diaphragm: Santropene
  • Inlet/Outlet: 1/2" Threaded MNPT

SEAFLO 42-Series Boat and RV Pump

Ease Of Use

This pump features industry standard fittings, wiring, and mounting base to directly replace similar competing pumps.

Beats The Competition

The three-chamber high volume design is driven by a heavy-duty motor which produces flow rates of 3.0 GPM and 55 PSI. It is capable of self-priming up to 6 vertical feet and can run dry, making it a clear cost to performance leader.

DP

Bilge

WDP

Dry Bilge

Diaphragm Pumps

Ranging from 1 to 5 GPM capacity, SEAFLO automatic demand water pumps have a built-in pressure switch which automatically starts and stops when the faucet is opened and closed. They're easy to install, service and winterize.

Bilge Pumps

The SEAFLO Submersible non-automatic bilge pump line handles bilge water evacuation and is controlled by a panel or float switch. They all include Anti-Airlock protection and moisture tight seals with marine-grade blocked wiring. The removable strainer base fits industry standard mounting conventions, so you’ll have no problem swapping to SEAFLO.

Washdown Pumps

SEAFLO’s washdown kits are the best choice for cleaning boats, fish boxes, anchor wells, dinghies, and other similar applications. Ranging from 3 to 5 GPM capacity and with an on-demand switch, the pump automatically turns on when you squeeze the spray gun handle.

Seaflo Dry Bilge System

The SEAFLO Dry Bilge System is the most economical and reliable way to keep your bilge clean and completely dry. The SEAFLO Dry Bilge System removes all still water from the lowest part of your bilge, or other water-containing compartments. The system is self-priming up to 25 feet, so it can be mounted remotely from the suction foot. The system is activated either by the easy-to-use programmable timer, or manually by a toggle switch.

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SEAFLO 55-Series SEAFLO 55-Series Washdown SEAFLO 55-Series Accumulator Tank Combo SEAFLO Bilge Pumps SEAFLO Dry Bilge System
Customer Reviews
4.2 out of 5 stars
530
4.2 out of 5 stars
438
4.3 out of 5 stars
248
3.3 out of 5 stars
85
GPM 5.5 5.5 5.5
PSI 60 70 60
Bilge Pump
Diaphragm Pump

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Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)


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Important information

Bulb Voltage

12 volts

Customer reviews

4.4 out of 5 stars
4.4 out of 5
1,927 global ratings

Customers say

Customers like the quality, performance, flow and pressure of the water pump. They mention that it runs extremely quiet, is well made and reliable. Some appreciate the variable flow feature and the fact that it works well at low flow. That said, some complain about the seal.

AI-generated from the text of customer reviews

184 customers mention139 positive45 negative

Customers like the performance of the water pump. They say it works well at low flow, is an excellent solution to their problems, and is easy to replace. Customers also mention that it has a low noise level and is less power consumption.

"...It’s a great value for the price point and I’m very pleased with the performance." Read more

"Quiet. Good pressure and flow rate. Worked right out of the box like it should...." Read more

"...pump with this Seaflo 42 series has proven to be an excellent solution to my problems...." Read more

"...All features work properly.Today, however, it stopped working, not for lack of water to pump...." Read more

149 customers mention108 positive41 negative

Customers like the quality of the water pump. They say it's well-made, reliable, and does the job easily. Some mention that it feels more robust than the stock pump. Overall, customers are happy with their purchase and recommend it to others.

"...Beyond just the performance, it just looks, and feels like a much more quality item than what my RV came equipped with...." Read more

"...What an awesome improvement over the OEM pump. No more cycling. Perfect. I love it. Highly recommended." Read more

"...Update #2: The original pump finally failed during this historic California monsoon (Jan 2023) after almost 4 years in high-duty-cycle..." Read more

"...However, it seems like a solid, quality product, at this point. The above mentioned features and value have made me happy. :)" Read more

129 customers mention114 positive15 negative

Customers like the noise level of the water pump. They mention that it's much quieter, has a bypass mechanism, and runs extremely quiet.

"...It’s significantly quieter than my stock pump, and provides excellent pressure for both bathroom and kitchen sinks...." Read more

"Quiet. Good pressure and flow rate. Worked right out of the box like it should...." Read more

"...did slightly increase the water pressure (which helps), but it runs extremely quite..." Read more

"Works well in our camper. Quiet and not easy to set off. Does appear to me louder when turning the faucet on low...." Read more

87 customers mention63 positive24 negative

Customers like the pressure of the water pump. They mention that it is super quiet, has good pressure and flow rate, and that it works right out of the box like it should. Some customers also mention that the pump does slightly increase the water pressure, but it runs extremely quiet. The pump self-primes and has an automatic pressure switch, which turns it on when they open it.

"...It’s significantly quieter than my stock pump, and provides excellent pressure for both bathroom and kitchen sinks...." Read more

"Quiet. Good pressure and flow rate. Worked right out of the box like it should...." Read more

"...Needs good pressure to kick on properly." Read more

"...It did slightly increase the water pressure (which helps), but it runs extremely quite..." Read more

68 customers mention65 positive3 negative

Customers find the installation process of the water pump to be easy. They mention that it is simple to install.

"...It was easy to install.. didn't even have to read the instructions.. simple to replace the existing pump that was installed at the factory.. little..." Read more

"Works well in our camper. Quiet and not easy to set off. Does appear to me louder when turning the faucet on low...." Read more

"...Install was quick and easy, the water connections matched up perfectly with the old pump so no new plumbing or rerouting of pipes was needed...." Read more

"...This pump is very easy to install, as the thread is compatible with standard 2” sprinkler PVC pipes, (same thread as most pop-up sprinkler heads) so..." Read more

56 customers mention41 positive15 negative

Customers like the value of the water pump. They say it's a great upgrade from their old pump, and is worth the time.

"...It’s a great value for the price point and I’m very pleased with the performance." Read more

"I rarely write reviews, but felt this product was exceptional and worth the time. I am extremely happy with this product...." Read more

"...It’s not cheap, but it’s definitely much quieter and the bypass mechanism to avoid pulsing works quite well...." Read more

"...Sure it is quiet, inexpensive, good psi, boasting low flow capabilities and an impressive warranty..." Read more

44 customers mention36 positive8 negative

Customers like the flow of the water pump. They mention that it produces great flow and pressure, and is very quiet. The variable flow feature works nicely, and the pump runs smooth. They like that the rpm changes with flow pressure, making it easy to install. Customers also appreciate the smooth operation and the fact that the pump doesn't cycle at low flow.

"...Now I have a continuous flow of water at any pressure I want - from a mere trickle to a rapid flow - this pump has exceeded my expectations...." Read more

"...The variable flow and smooth, quiet operation (at lower GPM) sets this pump apart from many others I've used...." Read more

"...Sure it is quiet, inexpensive, good psi, boasting low flow capabilities and an impressive warranty..." Read more

"...Honestly my old pump was still working. And have a constant, no surge flow of water...." Read more

40 customers mention7 positive33 negative

Customers are dissatisfied with the seal of the water pump. They mention that it intermittently leaks, causing a pool of water under kitchen cabinets. The water also leaked into the dc motor and has already burnt up. The gasket in the black plastic section also leaked.

"...It supposedly has a four year warranty. It leaks badly. The seller is not responding to our request for return or replacement." Read more

"...on the back of the unit looked a bit rusted and there was a bit of water in the unit when I took off the end caps for the intake/outflow...." Read more

"...own pump, I don’t know what else to do… 1/2” NPT PVC with teflon tape, leaks… generic 1/2” NPT hose barb fittings identical to the Seaflo 1/2” hose..." Read more

"...Water was leaking through these screws and got to the motor and rusted it jamming it...." Read more

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Reviewed in the United States on December 8, 2023
Size: 12 voltsVerified Purchase
One person found this helpful
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Reviewed in the United States on January 18, 2024
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Reviewed in the United States on September 29, 2023
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Reviewed in the United States on July 10, 2022
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Reviewed in the United States on August 6, 2023
Size: 12 voltsVerified Purchase
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5.0 out of 5 stars It’s dead
Reviewed in the United States on August 6, 2023
I bought this pump two years ago installed it in 2022 spring use it on my boat and today it is dead won’t turn won’t work rusted although it’s plastic housing. It seem to not want to work under power. The wires were getting warm as if they were going to burn I just connected it it is seized.
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Top reviews from other countries

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Brent Tardif
5.0 out of 5 stars Works better than the original!
Reviewed in Canada on February 8, 2024
Size: 12 voltsVerified Purchase
Dr Rogo
5.0 out of 5 stars Excellent Product!
Reviewed in the United Kingdom on January 13, 2024
Size: 12 voltsVerified Purchase
Alberto
5.0 out of 5 stars Ottimo prodotto
Reviewed in Italy on January 1, 2024
Size: 12 voltsVerified Purchase
Carina
5.0 out of 5 stars detta är vad jag hade planerat
Reviewed in Sweden on November 18, 2023
Size: 12 voltsVerified Purchase
phil
5.0 out of 5 stars Eau potable
Reviewed in France on October 24, 2023
Size: 12 voltsVerified Purchase