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Old 10-07-2018, 01:38 PM   #1
Rivet Master
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2016 28' International
Trois-Rivieres , Quebec
Join Date: Jun 2018
Posts: 589
Does on-board water pressure regulator protect against excessive air pressure?

I dropped by a local RV dealer (non AS) to pick up a tube to connect to the input of my on-board water pump, to pump RV antifreeze into the water pipes. I mentioned that I had previously used an air compressor to clear out the water which led him to say that they didn't do this nor did he recommend it to his customers because of the risk of damaging the piping due to excessive air pressure.

There is an integrated 65 psi (max) water pressure regulator on the AS. Does anyone know if this regulator will also protect against excessive air pressure when winterizing? If the regulator mechanism is a diaphragm, will it work similarly no matter the nature of the "fluid"?
2016 International Signature CCD, RBQ, Dual A/C, 28'
2018 GMC Sierra SLE 2500HD, 4x4, Crew Cab, Duramax Diesel, Leer cap
DIY Solar: 500W Renogy panels, AM Solar hardware, Blue Sky MPPT controller and monitor, 470ah (C20) Rolls battery bank.
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Old 10-07-2018, 02:23 PM   #2
Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 15,033

First off, don't use an air compressor that lacks a pressure regulator. Next, don't set the compressor over 50 pounds. You can do a good job at 30 or 40 pounds.

To answer the question, the plumbing should be good to well over 60 pounds. Home water systems often get run well over that level without blowing up. The water regulator should not be counted on to work with air. It might work fine, but don't count on it.

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Old 10-07-2018, 02:25 PM   #3
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2014 20' Flying Cloud
Sag Harbor , New York
Join Date: Jun 2015
Posts: 17,538
Well said, Bob.

Belt and suspenders . . .

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