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Old 04-27-2015, 10:12 AM   #29
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Being a blank sheet of paper design I went with copper, with copper you will have to pre-plan every inch. Here is my thread

http://www.airforums.com/forums/f36/...-38289-59.html

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Old 04-27-2015, 12:51 PM   #30
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Pex all the way here. I've used it in both residential and travel trailer plumbing. Lightweight, easy to work with and repair. I use the copper crimp rings and brass fittings.
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Old 05-01-2015, 09:33 AM   #31
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5 years ago, I went 100% PEX w/ Sharkbite re-usable fittings (Sharkbite is costly but OH SO EASY/FAST!!!) for my TX home and my vintage AS. Also went with PEX for our 8000' NM mtn cabin which has seen as low as minus 30 degrees with NO freeze damage to the PEX, and that's after just the simplest gravity-drain, not any air blow-out. All three previously had copper but I just got tired of the (admittedly only occasional) inconvenience and time and bruised knuckles of replacing freeze-split copper (and I grew concerned that all the ancient solder in the joinery of the copper was leeching its Pb (lead) straight into my drinking water, but then plastics also seem to have a potentially negative "leech factor" of their own, I suppose) and I was especially convinced to go PEX by the "This Old House" projects - what a resource this program has been, especially for all those years before YouTube arrived. Water-Ice filled PEX is supposed to be able to expand 10% without freeze-breaking, then rebound when thawed; that 10% is a critical difference, a tad more than ice expansion itself. I have read that some PEX users have seen the brass fittings themselves freeze-break, but none of mine ever have in the 5 years time since I installed PEX everywhere. So, I HIGHLY recommend PEX. One more convenience to PEX: you can elect to color-code your water lines with red, blue and white PEX.
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Old 05-01-2015, 11:53 AM   #32
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PEX vs Copper

I'd use the PEX pipe and the brass fittings with the crimp rings. I'd avoid the Shark Bite fittings since they have an o-ring in them that will fail at some point. But if you use some Shark Bite fittings, make sure they are accessible so they can be replaced. I would not put them in a concealed wall.

My 2014 Sport 22 has PEX with plastic fittings installed at the factory, but I think the brass fittings are superior. In the past, with plastic water pipe systems, the pipe has been fine. It's the plastic fittings that have been a problem.

As far as copper, one nice feature about soft copper water pipe is that it can freeze three times before the pipe will burst. But it's expensive, heavy and harder to work with.

Good luck!
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Old 05-01-2015, 12:11 PM   #33
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PEX vs Copper

Also, the reason PEX is not used for propane or natural gas lines is that it's not rated for that use or designed for it and not safe for it.

There are chemicals in propane and natural gas that would damage the PEX pipe over time and cause a leak that could lead to an explosion.
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Old 06-07-2015, 10:47 PM   #34
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Last year I switched out the copper with its many, many patches for pex with shark bite fittings. I didn't like the shark bite fittings, I felt that with all the movement, and vibration with hauling my AS small leaks would appear. i simple jostling of the fitting would usually stop the leak but that is not satisfactory to me. So this year I am going to replace everything with the Uponor expansion fitting system. Once this is done I am done worrying about the H2O system.
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Old 06-07-2015, 11:57 PM   #35
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Quote:
Originally Posted by The Pirate View Post
Also, the reason PEX is not used for propane or natural gas lines is that it's not rated for that use or designed for it and not safe for it.

There are chemicals in propane and natural gas that would damage the PEX pipe over time and cause a leak that could lead to an explosion.
Special yellow PEX type pipe is commonly used for propane outside the home, as long as it is buried where the sun cannot get to it. My propane dealer put it between my tank and my home 16 years ago, and it is still working fine. It is also commonly used for natural gas outside, underground.
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Old 06-08-2015, 06:26 AM   #36
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Quote:
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Last year I switched out the copper with its many, many patches for pex with shark bite fittings. I didn't like the shark bite fittings, I felt that with all the movement, and vibration with hauling my AS small leaks would appear. i simple jostling of the fitting would usually stop the leak but that is not satisfactory to me.
Did you actually have this happen, or was it just a concern that it might happen? I ask because a few people on here have reported switching to shark bite fittings, and I don't recall seeing anyone mention a problem before. I also used shark bite fittings to replace a line that leaked in mine, and it's a connection I have to be able to get apart - at the water pump. (The pump threads were damaged by a PO by cross-threading them, so I carefully installed the fitting and used pipe dope to keep it sealed, then I just disconnect the shark bite connection for winterizing.) So, if there is a problem with the shark bite solution, I'd like to know about it.
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Old 06-08-2015, 06:42 AM   #37
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I would think about this stuff

I personally would think about this stuff.

Easy to use, a couple of hose clamps and you're done.

Silicone Braided Hose FDA and NSF 51 Grade On Harrison Hose & Tubing, Inc.

Just me,

Enjoy,
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Old 06-08-2015, 08:13 AM   #38
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I just wonder what the health consequences will be over the years. Polybutalene was a easy install back in the day except for the special crimper it required. It has been directly linked to a host of connective tissue and rheumatological problems.... Is PEX any different? We know the effects of Bisphenol-A in baby bottles and other food contact plastics. Just because the FDA and EPA say its OK ,is it really? Follow the money.
PEX is cheap, easy to work with and doesn't need special tools or skills.
Copper is expensive, requires fitting skills and is less forgiving. In most cases you need flaring tools, a special cutter, and something to solder with.
I have some PEX patches on my rig from the PO. I do believe I will ultimately replace them.
On the other hand, my drinking water from the tank is filtered, so with the comparatively small amount I consume, does it really matter?
Probably.
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Old 06-08-2015, 02:34 PM   #39
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PEX is the way to go. It's been used extensively in Europe for 4+ decades and can be expected to have a service life of 75 years when installed properly . Don't let it sit in direct sunlight for long while waiting to install, it is weakened by uv light like most plastics.
The old gray PBX lines were susceptible to chlorine embrittlement, not good when cities use chlorine to treat drinking water in municipal supplies. PEX doesn't have this problem.
It provides a buffer to freeze protection with its ability to expand, but not intended for multiple freeze thaw cycles.
It's flexible making it easy to run around curves and absorb some vibration. Still want to use tubing to/from pump and fresh water tank suction. Fittings are easy whether crimp or push on. Less susceptible to sweating, causing water drips onto wood floor in trailer.
As far as the CA lawsuit , everything in CA is know to cause cancer, I think including living in CA. I saw some wood, just wood, not PT or anything, that had a label to use caution when cutting because the dust was known to the state of CA to cause cancer.
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Old 06-08-2015, 04:18 PM   #40
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Does anyone know if a 2001 Excella 30 footer came from the factory using PEX. What I see is grey tubing
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Old 06-08-2015, 04:41 PM   #41
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The grey tubing is NOT PEX.


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Old 06-08-2015, 06:01 PM   #42
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As I had stated previously, I am going with PEX. I abandoned the manifold idea as being too bulky. I am using the crimp rings and brass fittings. I was discussing this all with a client of mine who is a plumber the other day. He suggested the Shark-Bite fittings due to the fact they should take vibration and flexing a bit better than crimp connections. He said to stick with the crimps since I started that way but to watch it closely...time will tell.
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