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Old 03-09-2015, 12:03 PM   #1
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Is this Pex ? See Pics - Looks like it but can't tell ?

Wondering if someone can tell me if this is PEX or what it may be ? Looks pretty solid PEX like , but I don't see those plastic connectors in the PEX isle at Lowes or HD ?? Need to fix a few spots and want to get the right tools and connectors .Thanks in advance.
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Old 03-09-2015, 12:24 PM   #2
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Not PEX, that is the older gray poly pipe used for a number of years in trailers and homes. It has turned out to be a problem as it ages, mostly the gray plastic fittings held on with crimp rings split and leak. Sometimes, but not too often, the pipe itself splits.

It is best to replace it with PEX pipe and fittings if you are doing any re plumbing in your trailer.
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Old 03-09-2015, 12:24 PM   #3
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I think that is PB (polybutylene).
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Old 03-09-2015, 12:34 PM   #4
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Thanks gents... Looks like I get to re do all the plumbing :_)
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Old 03-09-2015, 12:41 PM   #5
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PEX is easy so it won't be too bad of a job..
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Old 03-09-2015, 08:11 PM   #6
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Interesting find, rocker66. My 66 Trade Wind was plumbed in copper. I think that's the way it came from the factory. The old copper plumbing was a mess through the years of use and repairs. Maybe someone did yours in poly years ago. My 86 was plumbed in poly, and I have done the bath in PEX, but not the kitchen.

I replumbed my 66 it all in PEX. It takes a while to make each run, both hot and cold, both fresh water tank and city water inlet. I installed a new water heater under the street side bed (twin bed model). I had three leaks when I "air tested" it. All three were pipe fittings! I hate tapered pipe fittings. But that's how you connect the water heater, check valve, etc. The PEX crimps do not leak! And the "push to connect" shut off valves work good.

Have fun! It's like working on a ship in a bottle.

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Old 03-09-2015, 10:20 PM   #7
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Is this Pex ? See Pics - Looks like it but can't tell ?

Yes this appears to be polybutylene pipe. The poly fittings were the primary culprit but the pipe has been known to fail too. Chloramines adversely affect polybutylene pipe. Polybutylene pipe can provide many years of trouble free service, but full replacement may help you rest better.

As for repairs, they make pex to polybutylene fittings that will work if your piping isn't swollen or brittle.

If it were me I'd put re-plumbing near, or at the top of my "to do" list. Re-plumbing a rig with the interior intact isn't terribly difficult. Some sore knees, elbows, and a few bruises are what I typically encounter as sometimes you have to squeeze into to tight spots. Getting up and down from the floor will wear you out. If you go back with pex use crimp connections in lieu of the slip on plastic fittings which are much more expensive.

Good luck,

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Old 03-10-2015, 06:17 AM   #8
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That's polybutelene all right. Our trailer is infested with it, too. So far only one leak, and that wasn't really even the PB pipe's fault; the rubber washer at the connector on the pump failed (probably in part because someone cross-threaded the pipe on to the pump). But I just know one of these days I'm going to be replumbing the whole thing.

Kevin245, can you do it without dropping the belly pan?
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Old 03-10-2015, 07:17 AM   #9
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Should be no need to drop belly pan. Plumbing runs are typically all above the floor to prevent freezing.
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Old 03-10-2015, 07:56 AM   #10
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Originally Posted by Skater View Post
That's polybutelene all right. Our trailer is infested with it, too. So far only one leak, and that wasn't really even the PB pipe's fault; the rubber washer at the connector on the pump failed (probably in part because someone cross-threaded the pipe on to the pump). But I just know one of these days I'm going to be replumbing the whole thing.

Kevin245, can you do it without dropping the belly pan?

No need to drop the belly pan. Everything in ours is accessible above the floor.
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Old 03-10-2015, 07:58 AM   #11
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If anyone is attending the Springstream rally wants to practice working with pex, or make some pex repairs let me know and I will bring my tools.
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Old 03-10-2015, 11:09 AM   #12
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Yup! that's Pex...........80's to 90's vintage. Shark bite fittings are going to be your best friend working on that system.
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