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Old 07-24-2012, 05:56 AM   #1
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1974 27' Overlander
Perryville , Missouri
Join Date: Jun 2012
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1/2" pex to and from the water pump

I'm re-plumbing my 1974 27' overlander with 1/2" pex and now I'm up to the water pump (which I'm replacing with a new shur-flo pump). My question is can I use 1/2" pex everywhere, including into and out of the 3 gpm pump, or do I need something larger. My old pump was plumbed with something larger that looked like water hoses.

Thanks for the help.

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Old 07-24-2012, 06:39 AM   #2
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1972 31' Sovereign
Lexington , Minnesota
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1/2" is fine. Just get fittings that fit your pump. The larger hoses might be a replacement or repair by a PO.


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Old 07-24-2012, 06:43 AM   #3
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Morrill , Nebraska
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I would use a flexible connection to prevent more noise from the pump being transferred to the PEX and have it rattle throughout the trailer. Put a 1/2" female threaded fitting on the end of the PEX then screw in a hose barb fitting of the appropriate size for the hose.
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Old 07-24-2012, 07:17 AM   #4
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1988 25' Excella
1987 32' Excella
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I put in a new water pump and plumbed it with Pex. I put in a U loop to give it some flexibility in positioning. Works fine and makes less noise than the old pump with the hoses. I did not go all the way into the tank. I put a barb to Pex at a easy to access place at that end.
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Old 07-24-2012, 09:17 AM   #5
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1974 27' Overlander
Perryville , Missouri
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Bill, do you have any pictures of this set up?
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Old 07-24-2012, 10:40 AM   #6
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1968 28' Ambassador
Cedaredge , Colorado
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1/2 inch is fine. thats what I used. I have two fresh tanks going into one pump. you can see a picture of my set up here: Post #104

I put in a bypass to fill the tank under the trailer. you can't see it in the picture but I put the foam wrap pipe insulation around all my pipes to reduce noise. You can hardly hear it any more. It use to bang and vibrate before..

I just have some screw on fitting for the pump and they come off easy.


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