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  1. RV Water Pump
  2. Seaflo
  3. Diaphragm Pump
  4. 12V
  5. 1.2 GPM
  6. 35 psi
Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC

Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC

Item # SE37FR
Our Price: $29.99
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RV Water Pump
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Shipping Weight: 1.45 lbs
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Enjoy the comfortable water pressure of home with this self-priming, on-demand water pump. Supplies consistent water flow for 1 fixture. Includes a check valve to prevent backflow. Great Prices for the best rv water pump from Seaflo. Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC part number SE37FR can be ordered online at or call 1-800-496-5010 for expert service.
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Seaflo RV Water Pump - SE37FR

  • Diaphragm Pump
  • 12V
  • 1.2 GPM
  • 35 psi
  • Seaflo
  • 2 Fixtures
  • 140F
  • 60C

Enjoy the comfortable water pressure of home with this self-priming, on-demand water pump. Supplies consistent water flow for 1 fixture. Includes a check valve to prevent backflow.


  • Water pump provides a consistent flow of fresh water in your RV or boat
    • Comfortable water pressure makes your RV feel like home
  • 2-Chamber diaphragm ensures high-volume water flow for 1 fixture
    • Durable, abrasion- and corrosion-resistant santoprene construction
  • Self-priming unit removes air from pipeline, preventing delays and water spitting out of the faucet
    • Unit can be hidden from view because it doesn't require manual priming
  • Internal check valve prevents backflow contamination of your clean water supply
  • Automatic start-and-stop pressure switch helps prevent damage to the pump
    • Shuts the unit off if it becomes overloaded and starts to overheat
    • Turns the unit back on once core temperature reaches a tolerable level
    • Made for intermittent duty, but can run dry during priming without damage to the unit
  • Quiet operation - comparable to an indoor electric fan
    • Semi-rigid rubber base minimizes vibrations and is tear and corrosion resistant
  • Durable, energy-efficient, copper-core motor generates minimal heat
  • Enclosed housing and sealed switches prevent damage caused by moisture
  • Included filter prevents debris from entering and damaging the unit
  • Simple installation
    • Connects easily to tubing (sold separately)
    • Mounts in any position using bolts (hardware not included)
    • Can be mounted in a location higher than the water tank
  • Compatible with 12V DC systems


  • Overall dimensions: 6-5/8" long x 3-7/8" wide x 2-7/16" tall
  • Mounting hole pattern (center to center): 2-3/16" long x 3-1/8" wide
  • Ports: 3/8" barb
  • Maximum power draw: 4 amps
  • Flow: 1.2 gallons per minute (GPM)
  • Maximum pressure: 35 psi
  • Maximum water temperature: 140 F
  • 4-Year limited warranty

A water pump is needed to get the water from your RV or boat's fresh water holding tank up to your faucets. This automatic pump from Seaflo not only performs this task, but it also ensures a consistent flow and high-volume output for 1 fixture. It's energy efficient and runs quietly.

Seaflo pumps for RV fixtures

No-Mess Self-Priming

There are 2 types of pumps you can get for your RV: one that requires manually priming every time you run your fresh water tank dry, and one that primes automatically. Manual priming requires that you pour water into the pump, which can be inconvenient and messy. This pump primes itself, keeping you and your RV clean and dry.

Worry-Free Operation

Seaflo uses an automatic start-and-stop pressure switch that lets the pump run dry long enough to self-prime. If you turn your water on and realize you've unknowingly run your fresh water tank dry, the pump can run dry without damage while you shut the faucet and the pump off. The pressure switch also protects the pump motor from overheating when the water has been on for a while. So, if one of your kids leaves the faucet on, you're going to town with the washdown hose, or your teen takes a long shower (despite your asking them to conserve water), the pump will kick off when it starts to get hot. Once the motor has cooled, it will automatically come back on if the faucet or shower is still turned on.

To use this pump once it's installed, you only have to turn the water on!

Quick Tips: Some of our neighbors suggest unplugging this pump when you're traveling to prevent it from turning on accidentally if your faucets shake. And some of our feline-loving friends also recommend unplugging the unit any time you leave your cats unsupervised.


This pump can be installed on the floor, under a cabinet, or on the wall. Because this pump has a vertical, priming lift, you can install it up to 6' above your fresh water tank. Just make sure to measure 6' from the bottom of your holding tank. This is where the intake fitting will sit.

Pump feet and mounting pattern

Once you've determined the pump's location, it can be secured to its new home with 4 screws (not included).


A filter is included to prevent debris from entering the pump. To install this, just screw it inline with the inlet port. Once you have the tubing (sold separately) in place on the hose barbs, add clamps (sold separately) for extra security.

Fill your fresh water tank and turn your water faucet on to clear the lines of air. The pump should kick on immediately, but because self-priming can take up to a minute to complete, give it a little time to start producing water at the faucet.

SFDP1-012-035-21 Sea Flow 21-Series Diaphragm Pump for Boats and RVs - Variable Flow - Up to 1.2 GPM - 3/8" Barb - 12V

Video of Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Seaflo RV Fresh Water - Water Pump - SE37FR

Ellen: Hey everyone. I'm Ellen here and we're going to be taking a quick look at the SEAFLO diaphragm pump. You can use this for both marine or RV applications. And basically it's just going to help to pump that water wherever you need it. It could be used with freshwater or saltwater. And a lot of times it's going to be a replacement for maybe one that's already gone out in your RV or your boat, maybe even a food truck or something like that.

So this supplies that water pressure to your faucets, maybe it helps to move that water from one container to another, maybe you're getting it onboard your RV or something like that, or using it as a bilge pump or something else. It should be a pretty nice compact design to fit just about anywhere you'd want it to be.Going to take a closer to look at it and talk about some more of those detailed specs to make sure that this is the right fit for your application. As you can see, it's a nice compact unit and it should be pretty quiet as well. At the bottom, we'll have these semi-rigid feet. They are made of rubbers.

That should help to reduce any vibration or noise and help to dampen that out. It is self priming. So you can put this above the water tank up to six feet away. So a six feet lift from the water supply, and it should still have good pressure up to that point. We'll have two fittings on either side for our three eights inch tubing that this is going to work with.

And it does also have a builtin pressure switch. So as soon as you turn on that faucet or open up the valve for the water, it should detect that pressure and then kick on to pump the water through.It also has protection from running dry. So even if that does happen, it shouldn't damage the pump itself. It should still be fine for the next time, but you might need to re-prime the system to make sure that there's no air in it. So just keep that in mind.

It is a bolt on application with those little feet there, but it does not come with any hardware. So you will have to get some screws or bolts to put this in place. You might even be able to reuse the existing hardware from the pump that you're replacing, if you are replacing one. It's a pretty industry standard size. I'll give you those measurements in just a moment. It does also have a two chamber diaphragm, so it can give you that nice high volume water flow for up to two fixtures.Now, as far as those dimensions, overall size of the unit here is about. Looks like it's about six and five eighths inches long from end to end. Distance between those feet is about three and seven eights. The total height is about two and seven sixteenths, or just over two and three eighths. The distance between those mounting holes for the feet, center to center it's just shy of two inches. Looks like it's about 2 and an eighth. And then going this way, it's about three inches, about three and eight. The cord coming off of here, it looks like it's about 12 inches, 12 to 15 inches long.As far as the power draw with this, the max is four amps. It works with 12 volts. DC. The flow of water is 1.2 gallons per minute. And the pressure setting is at 35 PSI. The max water temperature this can handle is 140 degrees Fahrenheit. It is covered by a four year limited warranty. And that's pretty much it for our look at the SEFLO diaphragm pump for your boats and RVs. I hope this has been helpful in deciding this is going to be the right one for you. We do have some other options available here at, along with a lot of other accessories for your boats and RVs. So check them out. Thanks for watching.

Customer Satisfaction Score:

Customer Reviews

Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC - SE37FR

Average Customer Rating:  4.7 out of 5 stars   (20 Customer Reviews)

Enjoy the comfortable water pressure of home with this self-priming, on-demand water pump. Supplies consistent water flow for 1 fixture. Includes a check valve to prevent backflow.


It's a good dependable pump. Second one I've purchased. Super easy to hook up and mount. I use it for fresh water for coffee or to rinse dishes in my car camping set up. I have it hooked up to a six gallon tank I bought from e-trailer and to my battery. It pumps out of the tank when I press the kitchen spray faucets I hooked up. Great for filling the coffee pot or rinsing off my feet. Let go of the spray and the pump stops. Nice inexpensive set up that works.


I bought this pump as an external source to pump RV fluid in my camper. PERFECT answer for an easy answer for winterizing - quick & easy!!


Solid little pump has cycled off/on many thousands of times in the last year. I use it on a remote tank to feed water to my roof top swamp coolers here in the desert. Good pump.


Works great for the hunting cabin, pumping water from a 5 gallon jug to the sink faucet. Plenty of pressure and built in shut off is a plus.


This is a replacement for the same pump that failed in my camper (motor locked up; unrepairable.) I'll have to see how this one performs.


the pump is smaller in size than I expected and while it won't work for its original reason, I do have another use for it in my fishing boat.


Just what the doctor ordered. Great value and fit like a glove.


I think it's a hell of a deal


Very nice pump at a very fair price


Pump looks fine so far.


Looks like a great compact pump for a tight space. With do fine for a single fixture application.


Everything is working great
David - 11/12/2022


Fast delivery reasonable price!









See what our Experts say about this Seaflo RV Water Pump

  • Is There a 1 GPM Water Pump for RV's
    The lowest power water pump we offer is the Seaflo Diaphragm Pump for Boats and RVs part # SE37FR which has a flow rate of 1.2 gallons per minute, aka GPM.
    view full answer...
  • Recommended RV Water Pump For A 4 Gallon Water Tank
    RV water pumps like the Seaflo Diaphragm Pump for Boats and RVs # SE24FR pressurize your trailer's plumbing up to their specific psi rating and kick on when the psi starts to drop. With you only having a 4 gallon tank you would quickly blow through the water in it with a pump so the # SE24FR is a bit overkill for your needs. I recommend going with a lower psi and GPM model unit like the Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 1.2 GPM - 35 psi - 12V DC # SE37FR. This...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Alexander C
Written by:
Alexander C
Employee Noah M
Updated by:
Noah M
Employee Sabrina W
Updated by:
Sabrina W

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