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  1. RV Water Pump
  2. Seaflo
  3. Diaphragm Pump
  4. 12V
  5. 3.0 GPM
  6. 55 psi
Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 3 GPM - 55 psi - 12V DC

Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 3 GPM - 55 psi - 12V DC

Our Price: $67.94
RV Water Pump
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Shipping Weight: 5 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 up to 4 fixtures. Includes a check valve to prevent backflow. Lowest Prices for the best rv water pump from Seaflo. Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 3 GPM - 55 psi - 12V DC part number SE57FR can be ordered online at or call 1-636-306-4830 for expert service.
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  • Reviews (38)
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Seaflo RV Water Pump

  • Diaphragm Pump
  • 12V
  • 3.0 GPM
  • 55 psi
  • Seaflo
  • 4 Fixtures
  • 140F
  • 60C

Enjoy the comfortable water pressure of home with this self-priming, on-demand water pump. Supplies consistent water flow for up to 4 fixtures. 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
  • 4-Chamber diaphragm ensures high-volume water flow for up to 4 fixtures
    • 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 to standard NPT connections - includes hose barb fittings for 1/2" hoses too
    • 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: 8" long x 4-15/16" wide x 4-3/8" tall
  • Mounting hole pattern (center to center): 2-7/8" long x 3-1/4" wide
  • Ports:
    • Inlet 1/2"-14 male PT
    • Outlet: 1/2"-14 male NPT
  • Maximum power draw: 7.5 amps
  • Flow: 3 gallons per minute (GPM)
  • Maximum pressure: 55 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 up to 4 fixtures. This means you can run your shower and your kitchen faucet at the same time without losing pressure. It's also 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.

The fittings on this pump are male NPT ports. Screw the 1/2"-14 NPT hose barbs onto the pump fittings. The hose barb fittings have wingnuts to make it easy to turn the fittings by hand. Once you have the tubing (sold separately) in place on the hose barbs, add hose 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.

SFDP1-030-055-42 Sea Flow 42-Series Diaphragm Pump for Boats and RVs - Variable Flow - Up to 3 GPM - 1/2"-14 MNPT - 12V

Item # SE57FR

Customer Satisfaction Score:

Customer Reviews

Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 3 GPM - 55 psi - 12V DC - SE57FR

Average Customer Rating:  4.8 out of 5 stars   (38 Customer Reviews)

Enjoy the comfortable water pressure of home with this self-priming, on-demand water pump. Supplies consistent water flow for up to 4 fixtures. Includes a check valve to prevent backflow.


Installed it in an outdoor shower at the cabin. It's working great off of a small solar powered battery


The pump is very nice and quiet! My wife is extremely happy! I subtracted one star for the fittings, they both leaked! A small o ring in the fittings fixed the leaks!


So quiet I couldn't hear it running with my music playing


Easy replacement, & I am liking the 4 year warranty


Bought to replace a leaking Artis products pump. So far, so good. Arrived today 2/17 and installed shortly after. Definitely quieter than the one I just took out. I have had great service and fast shipping from etrailer! Thanks!


Only used a few times but is working great. Delivery was on time.


I haven’t installed it yet but it looks good! Thanks


Best water pump I have ever had reallly happy with it thanks you guys are great.


Great quality product like all products in my opinion.


It was a perfect replacement for our original pump. It worked immediately after installing it.


Easily installed. Very,very quiet pump. You don’t even know it’s running. Good flow of water. I will certainly recommend this water pump to everyone, And I’ll tell them to get it from e-trailer. Really fast delivery.


Just what I needed. Great price and super fast shipping.


Working as designed
Thank you great


Looks to be a high quality pump.good price just what i wanted to replace old unit


Installed on a 1970s Ken-Craft great pressure easy to install.


Quiet, powerful ez install what more can one say


Easy order process. Got pump very quick. Haven’t installed yet but tested and very satisfied with its performance


It does what it's supposed to do, a little noiser then I hope it would be.








Show More Reviews

See what our Experts say about this Seaflo RV Water Pump

  • Is Seaflo Diaphragm Pump a Good Pump Replacement for Shurflo 4028-100-E54
    Yes the Seaflo Diaphragm Pump for Boats and RVs # SE57FR would be a great replacement for the Shurflo 4028 that you have now. It'll be quieter and also provide more water pressure while also being an easy install.
    view full answer...
  • Can Seaflo Diaphragm Pump SE57FR Replace Flojet 03526144
    Yes, you can absolutely replace your Flojet 03526144 with the Seaflo pump you asked about, which is the following part number: - Seaflo Diaphragm Pump for Boats and RVs - Variable Flow - 3 GPM - 55 psi - 12V DC # SE57FR This will be a direct fit and you won't need any other parts or accessories to go with it.
    view full answer...
  • Quieter RV Water Pump Recommendation
    We have found that the Seaflo Diaphragm water pumps like the part # SE57FR are very quiet compared to other options but especially compared to the Shurflo pump you have. This is also a 3 gallon per minute pump rated for 55 PSI.
    view full answer...
  • Difference Between, and Power Supply for Seaflo Diaphragm Pump
    The difference between the two pumps is that the Seaflo Diaphragm Pump for Boats and RVs # SE58FR has a 3-chamber diaphragm for water flow up to 2 fixtures, while the Seaflo Diaphragm Pump for Boats and RVs # SE57FR has a 4-chamber diaphragm for water flow for up to 4 fixtures. In regards to power supply, according to the manufacturer these each require their own dedicated circuit and are 12 volt only, with the red lead going to the positive terminal of your battery and black lead going...
    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...
  • Water Pump Options For a 2010 Tiffin Allegro Motorhome
    I have listed out a few options for you below. Unfortunately, there isn't anything that tells us what water pump you currently have in your 2010 Tiffin Allegro, so I have listed out water pumps that work with a different number of fixtures. 2 Fixtures - Seaflo Diaphragm Pump for Boats and RVs # SE58FR (45 psi) 4 Fixtures - Seaflo Diaphragm Pump for Boats and RVs # SE57FR (55 psi) 6 Fixtures - Seaflo Diaphragm Pump for Boats and RVs # SE24FR (60 psi) You would just want to select the...
    view full answer...
  • Can the psi be of the Seaflo 60 psi Diaphragm Pump Be Adjusted
    No, the Seaflo Diaphragm Pump, # SE24FR is a 12 VDC pump that flows up to 5.5 gallons per minute and pressure setting at 60 psi. This is a variable flow based on demand, there is not an adjustable setting on the unit itself to make changes. If you are needing your pump to be within the 45-55 psi range you would want to go with one of the below pumps: - Seaflo Diaphragm Pump for Boats and RVs # SE58FR (45 psi) - Flow Max RV Fresh Water Pump # LC689052 (50 psi) - Seaflo Diaphragm Pump...
    view full answer...
  • Recommended Replacement for Shurflo 4008-101-A65
    Per the specs of the Shurflo 4008-101-A65 it looks like we have two very good options in the HydroMax RV Fresh Water Pump, # P25201 and the Seaflo Diaphragm Pump for Boats and RVs, # SE58FR. Each are 12VDC pumps and rated at 3 gallons per minute and receive great customer feedback. I suggest the the HydroMax RV Fresh Water Pump, # P25201 because of the slightly higher pressure of 55 psi over that of the Seaflo's 45 psi and the additional amount of customer ratings that this pump has received....
    view full answer...
  • What Power Source is Seaflo Water Pump part # SE57FR Designed to Run On
    The Seaflo Water Pump part # SE57FR was designed to run on 12 volts so easiest solution would be a car battery like you mentioned and let it run off of that. You could keep the battery charged with a charger like the # CTEK56865.
    view full answer...
  • Recommendations For Replacing RV Water System Components
    I drew up a little diagram of how RV water systems are typically designed and attached it below to make it easier for you to see each component. I believe what you're referring to is simply just the fresh water tank drain, which you could use part # CAM22243 to tie into your tank and allow it to drain. The Anti-Siphon valve # A01-0141VP you were looking at simply connects to a Valterra Hydroflush # F02-4100 for you to hook up a garden hose and clean out your black tank. For the fresh...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Alexander C
Written by:
Alexander C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Installed by:
Michael B
Employee Clayton O
Test Fit:
Clayton O
Employee Kevin C
Test Fit:
Kevin C
Employee Noah M
Updated by:
Noah M
Employee Sabrina W
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