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Old 05-15-2015, 07:31 PM   #1
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Water Pressure Regulator with Pex Piping

My new class C has PEX pipe throughout. Do I still need to use a regulator when hooking up to site water?
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Old 05-15-2015, 08:24 PM   #2
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Your manual should indicate the maximum pressure you should have. I think the new stuff is 60 but don't quote me on that. I keep a regulator set for 60.

Remember, its just not the PEX hoses, the fittings and other plumbing fixtures you have to keep your eye on.
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Old 05-15-2015, 09:01 PM   #3
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You need a regulator because campground pressures will vary. Our city water at home is 80 psi so I need one even when filling FW before leaving. Always use the regulator. Better safe than tearing out a flooded RV..
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Old 05-16-2015, 12:44 AM   #4
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Recent post here showing a pressure gauge reading of 120psi at a campground.

The city water inlet should have a pressure regulator mounted behind the panel - BUT fairly widely regarded as a bit dinky and prone to failure so many owners fit a Watt regulator on the faucet (which has the added advantage of helping the hose last a lot longer.
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Old 05-16-2015, 02:00 AM   #5
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Yes you need a regulator. Pex can withstand a LOT of pressure but your fixtures, etc can't.

I know. Long story.
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Old 05-16-2015, 09:21 AM   #6
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I'm not sure why you would even consider not using something, the cheapest of which are available for under $10, that could save you thousands in repair costs .
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Old 05-16-2015, 05:14 PM   #7
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I was just asking because the water seems to just trickle. My neighbor has a new class A and they don't use one. Maybe it's built in I don't know. Heck maybe I have a built in regulator. I'll have to look.
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Old 05-16-2015, 05:15 PM   #8
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It is not the pipe you need to worry about

And the answer is YES.
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Old 05-16-2015, 05:19 PM   #9
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I agree with all the above; PEX is not your issue. Think about the other connections and water heater when it comes to pressure. I use a pressure regulator (the external expensive kind) to protect my water heater (aqua-hot) and connections to my manifold that are not PEX. It is just the sane thing to do.

And your second post makes it look like you have a plugged regulator on your water input. Many of the "city water" connections come with built-in regulators that I think are just barely worth the effort. I took ours apart, drilled out the regulator part, epoxied a relief hole in the housing and added an external household pressure regulator. This was one of the best moves I ever made.
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Old 05-23-2015, 10:28 AM   #10
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I tried several different regulators and was never happy. Now I just have a gage inline and keep an eye on it. No issues so far. Most campgrounds are low if anything
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Old 05-23-2015, 12:27 PM   #11
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Bottomless Lake state park at Roswell NM water pressure was 110 psi 3 years ago. I would not have believed it had I not seen it on my gauge.
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Old 05-23-2015, 03:28 PM   #12
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Quote:
Originally Posted by FBPatriot74 View Post
I was just asking because the water seems to just trickle. My neighbor has a new class A and they don't use one. Maybe it's built in I don't know. Heck maybe I have a built in regulator. I'll have to look.
Are you using one on your hose now ? They can and do, go bad. I've replaced at least one over the years.
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Old 05-23-2015, 03:48 PM   #13
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The best way to make a pressure regulator is buy the big one at Lowe's for the house and install water hose adapters. You can control the pressure without losing the water volume.
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Old 05-23-2015, 06:05 PM   #14
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I was warned repeatedly at one CG to ensure I put a pressure regulator on since their pressure was excessively high. PEX can take high pressures but some fittings poorly made up might not be able to.
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