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Thread: Pex fittings leak
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02-16-2019, 03:03 PM #1
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Pex fittings leak
Recently discovered wet floor in cargo area . When I opened it up I found a leak at one of the "tee" fittings in the area behind the water control panel. After fixing that I could hear water dripping. Discovered another drip from a "tee" near the water heater. I haven't fixed that one yet. I have to figure out how to get to it. Question is how many more and how long has this one been leaking. I am surprised since these are "PEX" fitttings. Shouldn't be leaking. Always an adventure RVing.
2015 Reflection 337RLS
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02-16-2019, 03:45 PM #2
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Some members have almost literally rebuilt their entire plumbing system. Use the Advanced Search function and select the Plumbing sub-group, then search on username @Cate&Rob. The threads returned will keep you reading for days.
2017 Ford F-350 DRW 6.7L Platinum
2019 315RLTS (purchased 16 Jul 18 from Campers Inn RV in Byron, GA)
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02-16-2019, 04:04 PM #3
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Lots of discussions on this forum about Grand Designs use (and defense) of soft (braided) hose with PEX connectors and crimp bands. Seams like most will eventually start leaking. The PEX fitting is slightly to small for the ID of the braided hose and the pinch clamp does not tighten enough. Search for PEX and leaks in the search box (upper right of each page - just above the "advanced search" button for lots of information. Rob @Cate&Rob has completely redone his water plumbing to eliminate these mismatched components and has a lot of very good information on what is involved.
ChrisChris & Karen
Fort Collins, CO
2017 F-350 SRW 6.7 Lariat Value CC LB 4x4
2018 Solitude 310GK - Sold 7/2023
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02-16-2019, 04:14 PM #4
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Think there's any truth to the rumor that the Mighty Plumber (Nintendo) character was based on @Rob's plumbing exploits?
2017 Ford F-350 DRW 6.7L Platinum
2019 315RLTS (purchased 16 Jul 18 from Campers Inn RV in Byron, GA)
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02-16-2019, 04:53 PM #5
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I found a leak in ours today, right at the fitting to the water filter. It too is a braided soft hose on what appears to be a pex fitting. I rally don't like those things. Getting the pex clamp off was a real treat as I don't have the proper tool for them. I put on a regular hose clamp but had to really crank it down tight to get to not leak.
I looked all around underneath and don't see water coming out anywhere else but I am now more nervous than I was before about this problem.
It would seem that any one with a half working brain would be able to figur out that putting a hose of a slightly larger diameter than the fitting is designed for is a bad idea, then to use a clamp that is not designed for this type of hose is an even bigger mistake.
I hope Grand Design comes to their senses and does something to make these right.2022 Reflection150 226RK
2022 F150 Powerboost hybrid with 3.5L Ecoboost
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02-16-2019, 04:54 PM #6
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Welcome to the club.
The good news it isn't that difficult for the most part to swap the soft hose to PEX.2019 Momentum 395
2018 Ram 3500 DRW 4.10 AISIN
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02-16-2019, 05:31 PM #7
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Marcy & Gary
2014 Grand Design - Reflection 303RLS
2022 GMC 3500 Denali Duramax Longbed SRW
2015 GMC Denali 3500 - Retired
2003 F350 - retired
Michigan
We're in trouble now, the dog are bloggin'!
https://3dogsandatrailer.wordpress.com/
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02-16-2019, 06:49 PM #8
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I had a leak to the side of my Kantleak valve. It was a bunch of nylon fittings put together by Grand Design.
One started leaking, and I disassembled all the fittings and screwed them back together with Gray Teflon tape. It is thicker and works better than the thin White Teflon tape. No problems since.
I was talking to our campground maintenance men who have 25 rental trailers to look after. All their plumbing now is done with nylon fittings, and they've given up on using PEX fittings.
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02-16-2019, 09:01 PM #9
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2022 Reflection150 226RK
2022 F150 Powerboost hybrid with 3.5L Ecoboost
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02-17-2019, 05:11 AM #10
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Is there a tool to remove the pex cinch clamp
Other than a pair of side cutters?
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