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Old 09-13-2016, 06:53 AM   #1
sharker6
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2017 29RES max water pressure

Hi, This is my third RV and I've always kept the water pressure at 40 PSI. I remember the dealer saying I could increase the pressure on my new Cougar to something over 40 PSI but I don't remember what it is. The owners manual isn't saying what the max pressure should be. Anyone know the answer?
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Old 09-13-2016, 06:58 AM   #2
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2017 29RES max water pressure

Welcome to the forum!!

I wouldn't go over 50. The non adjustable regulators are set to 45-50 PSI.
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Old 09-13-2016, 12:52 PM   #3
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Ok my dealer said the modern plumbing systems are capable of handling standard city water pressure so what would be the reason to limit the pressure? My Cougar is all PEX not the old school vinyl tubing. The only thing I see in the system that could be an issue is the water pump itself as everything else looks like it would handle the unrestricted city pressure. Our city pressure in my town is somewhere between 50-60 psi so unless you got some crazy pressure somewhere I don't see the issue for just 5-10 psi or so. Most campgrounds I stay at you need the pump anyway as they seem weak at 25-30 psi, stayed at one northeast of Columbus and it was 10 psi most of the time.
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Old 09-13-2016, 02:12 PM   #4
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As previously stated, you need pressure regulation. It's cheap insurance, ten bucks of regulator, will save you several hundreds in water damage! Also odds are your "salesman never spent a night in a campground. LOL

I personally wouldn't go above 45+/- psi. While some campgrounds are substantially under pressure, I've also stayed at CGs with 110psi. Guaranteed to find every weak connector/ leaky seal in your entire camper... all over your carpet/tiles/countertop etc... if not regulated. It's not worth it to me, I've lived very comfortably with a pressure regulator for 35+ years.If the CG water pressure is OK it will pass thru, if not, it will be automatically dialed back to a safe level.

If you suddenly need extra pressure, for a wash down, you can always Siamese at the water tap with a "Y" valve, and a garden hose.

Good Luck,
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Old 09-13-2016, 04:23 PM   #5
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It's true that the PEX plumbing in "modern RV's" is the same as most "stick built" houses. That isn't the concern. Rather it's the "lowest bidder" plastic faucets, PVC elbows and Tees that scare me. I've lived with a pressure regulator for a number of years and never had a problem. Like others, I've been to campgrounds with water pressure well over 100 PSI and with the regulator, my "cheap plastic plumbing" never knew the difference and was "as happy" as the PEX attached to it.......
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Old 09-13-2016, 06:24 PM   #6
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Least common denominator - RV plumbing fixtures

Quote:
Originally Posted by JRTJH View Post
It's true that the PEX plumbing in "modern RV's" is the same as most "stick built" houses. That isn't the concern. Rather it's the "lowest bidder" plastic faucets, PVC elbows and Tees that scare me. I've lived with a pressure regulator for a number of years and never had a problem. Like others, I've been to campgrounds with water pressure well over 100 PSI and with the regulator, my "cheap plastic plumbing" never knew the difference and was "as happy" as the PEX attached to it.......
Agree with these comments, and know from personal experience. Hooked up at home quickly one time to the hose, and just forgot about the pressure coming from the tap. The sink faucet just came apart, and surprisingly, the first thing the happened, is the spout just blew out of the faucet assembly. It was a friction fit, and had 2 'o-rings', but the pressure was too much for the spout/aerator. At first I thought it was just the aerator was just clogged with the usual crud, but replaced it, and same thing.

Ended up replacing it with a regular home Delta faucet I found on clearance at one of the big box lumber yards. Fortunately, didn't find any other leaks. Of course don't like the standard vanity faucet, so looking for that, but need another clearance special.
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Old 09-14-2016, 06:24 AM   #7
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I went with the newer Valterra regulator. It's 50-55 psi.

https://www.amazon.com/Valterra-A01-...ater+regulator
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Old 09-14-2016, 09:52 AM   #8
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If you guys are finding pressures that high you would surely need a regulator. My neighbor that works for the local water company told me that "code" is 85 psi max and if it exceeds that the city is responsible to provide a "pressure regulating valve" (PRV) to the customers. He also told me that a lot of city's across the country are upgrading their systems for more pressure 100-110 psi for the fire departments and installing PRV's in all the homes at no charge. I have a regulator but so far I have never found a place that forced me to use it, for me it's always the other way around and lacking pressure.
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Old 09-14-2016, 10:05 AM   #9
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Thanks for the informed info. I dialed my adjustable to a hair over 50 psi and will keep an eye on it. I also left mine off by mistake about 10 years ago and paid the price at the fittings going to the water heater and pump.
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Old 09-14-2016, 06:02 PM   #10
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here is my tip of the day, always turn the water off when you are camping and leave for a while(day trip) etc and only turn the pump on when you need it. no need to cause any unnecessary flooding.
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Old 09-15-2016, 01:52 AM   #11
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All good info/advice. Recently found damp carpet outside the cabinet in which the pump is stored. Removed the access panel to find a fine mist of water coming from the pump discharge quick connect fitting (FloJet). There was a hairline crack in the fitting. Local RV dealer had a bag of assorted fluted and threaded fittings for $10 - so the fix was easy.
We were at a campground that had very high water pressure. We had just returned from a day trip. Luckily, we caught the leak as soon as we turned the water back on. Trailer is 5 years old and we always use one of those non-adjustable regulators. Something else to carry in the spare parts tote
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Old 09-15-2016, 03:43 PM   #12
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Jsmith - do I understand correctly that you turn off your water when you leave the campsite for the day? I have never thought to do that, but it makes a ton of sense.
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Old 09-15-2016, 03:50 PM   #13
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That's correct. Good thing too. We were gone about 8 hrs. Would have been a real mess.
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Old 09-16-2016, 12:56 PM   #14
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RVing seems so simple, yet I am amazed at what I learn from this forum every day. Thanks much.
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Old 09-16-2016, 02:55 PM   #15
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RVing seems so simple, yet I am amazed at what I learn from this forum every day. Thanks much.


Come spend a week with me working on them..
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Old 09-20-2016, 02:03 PM   #16
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Come spend a week with me working on them..
Yeah, we are first time RV owners after a lifetime of tent camping. I grew up fishing the Chesapeake Bay. Not until reading this forum did I come to realize the RV is a land yacht - a hole in the ground to pour money. Our 5er is relatively new so no problems so far, but some where, some time when we least expect it...$$$$

So as an RV tech expert, when you are camping is it easy to crack open a cold one and just watch as the guy next door struggles with a problem or is that where you do your pro bono work
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Old 11-15-2019, 09:17 PM   #17
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It's not the pipes you have to worry about, it's the cheap faucets and fittings you need to worry about, the pressure shouldn't be more than 45-50 psi. Or the fixtures can crack, or fittings can break.
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Old 11-16-2019, 06:50 AM   #18
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Originally Posted by JRTJH View Post
It's true that the PEX plumbing in "modern RV's" is the same as most "stick built" houses. That isn't the concern. Rather it's the "lowest bidder" plastic faucets, PVC elbows and Tees that scare me. I've lived with a pressure regulator for a number of years and never had a problem. Like others, I've been to campgrounds with water pressure well over 100 PSI and with the regulator, my "cheap plastic plumbing" never knew the difference and was "as happy" as the PEX attached to it.......
The other side of this. The S&B house had the plumbing installed by a licensed master plumber or his apprentice under his charge. At the RV assembly plant the guy/gal doing the plumbing before lunch may the person installing the decals on the exterior after lunch.
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Old 11-16-2019, 07:05 AM   #19
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So as an RV tech expert, when you are camping is it easy to crack open a cold one and just watch as the guy next door struggles with a problem or is that where you do your pro bono work

I don’t consider myself an “expert” but yes I will offer my services with nothing expected in return. After all we are ALL just trying to enjoy ourselves.
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Old 11-16-2019, 01:20 PM   #20
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Quote:
Originally Posted by jsmith948 View Post
All good info/advice. Recently found damp carpet outside the cabinet in which the pump is stored. Removed the access panel to find a fine mist of water coming from the pump discharge quick connect fitting (FloJet). There was a hairline crack in the fitting. Local RV dealer had a bag of assorted fluted and threaded fittings for $10 - so the fix was easy.
We were at a campground that had very high water pressure. We had just returned from a day trip. Luckily, we caught the leak as soon as we turned the water back on. Trailer is 5 years old and we always use one of those non-adjustable regulators. Something else to carry in the spare parts tote
I would be cautious using those non adjustable “regulators”. I have used them before going with a real regulator, and use a gauge on the line inside the convenience center of our fifth wheel, and one day noticed the pressure slowly going higher while I watched. It just kept climbing and we were in one of those parks that have pressure in excess of 100 psi. Those cheap things are really nothing more than a restrictor rather than a regulator. Spending the bucks to protect your plumbing with a quality regulator is just like using a good EMS device to protect your electrical system in the RV.
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