Do I Need to Install A Check Valve After The Seaflo SE57FR Water Pump?

Question

Question:

Hi, do I need to install a check valve after the Seaflo SE57FR pump to stop back flow when connected to city water? Thanks Ken

asked by: Kenneth D

0

Expert Reply:

Hello Ken,

Great question.

No, you do not need to install a separate check valve after the Seaflo Diaphragm Pump # SE57FR. The pump has a built-in check valve that prevents city water pressure from flowing backward through the pump and into the fresh water tank.

As long as the pump is installed correctly, the internal check valve is designed to handle this function on its own, so an additional check valve is not required when switching between the onboard water system and a city water connection.

Are you replacing an existing pump in your RV, or are you upgrading your water system before your next camping trip?

expert reply by: Kate F

0

Water Pump Installed
(click to enlarge)

Kenneth D.

6/2/2026

Hi, thanks for getting back to me. The pump is for a initial install on a promaster van conversion. Thanks again. Ken

Kate F.

6/2/2026

@KennethD My pleasure Ken! If you run into anymore questions, you know where to find us.

Russell

6/3/2026

Hello, The water pump in question has never been installed on my RV, and is still in the box stowed in the compartment where the original water pump is located. I keep it as a "just in case" item. Sorry I cannot offer any more info.

Kate F.

6/3/2026

@Russell Thanks for the response Russell. I would like to add you are a very smart man =)

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