Redwood

Because of the nature of the barbs and the slick plastic fittings will turn but not leak.

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Bill

This is what I have always used underground

http://b.shoponlineaabbcc.com/cresli...yethylene-pipe

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Virginia Plumbing Codes
Virginia Department of Licensing


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Everything in the known universe is governed by "Cause and Effect", there is no getting around it. Think about what you do before you do it.

M5Plumb

I'd use that to sleeve my Wirsbo or Rehau in river rock areas here in PDX / Vancouver.

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futz

What kind of fitting? Did you use a stainless insert?

markb

What do you mean by stainless insert? I just put it into the corporation cupling and tighened the thing. Do they make inserts for pex in corporation cuplings like the inserts we use when we use 3/8" compression fittings with plastic 3/8" pipe?

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--
Never give in. Never give in. Never, never, never, never--in nothing, great or small, large or petty--never give in, except to convictions of honor and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.
- Winston Churchill

futz

If you're using Mueller or Ford or other similar compression fittings and you put poly or pex pipe in them without a SS stiffener insert then you are going to have harsh problems down the road. Sooner or later one will blow off. That plastic pipe won't get grabbed by the fitting's tooth ring properly and it will creep out if it can. Sometimes the dirt will hold things together and it'll just leak a bit and no one will ever know. But other times it will just work its way out and boom, you have a huge expensive leak bubbling up under someone's driveway. Don't forget to put in your inserts!

HandsomeMike

I know in Saint Charles County, Mo. they have been using HDPE for services for at least twenty five years. Pex is approved for underground, just no sunlight.

Miguel

No insert? You gotta use the SS insert sleeves or it'll blow off!!!
Hopefully it doesn't but geez. (It should hold as long as the temps remain low)

We normally use HDPE CTS sized (not 1404 PE that uses the barbed insert fittings). It's thinner walled than the 75# black PE waterline but it's a different grade and much tougher. 160# & 200#. I'd equate it to PEX for durability but I've never used PEX other than the old "Blueline" that was apparently made for service lines.
We use Muehler or Ford depending on the dimension ratio (ie: DR11 vs DR17. CTS is DR9) but plastic requires the SS sleeves or "inserts" to make a viable joint.

Within city limits they require copper so no sleeves required but it sure ups the install price big time!

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BOOM-diyada! Life is good!

markb

hhmmm interesting. Well, while I have my fingers crossed, can someone post a link to the sleeves? That way I can print it out and get my wholesaler to order some.

__________________
--
Never give in. Never give in. Never, never, never, never--in nothing, great or small, large or petty--never give in, except to convictions of honor and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.
- Winston Churchill

futz

If they're selling the fittings they must have inserts for them. They come from the same company. Not "sleeves" - ask for inserts.

Here's a link to Ford's site - Section J - with a crappy pic of an insert stiffener at bottom right.

Here's a better pic of what they look like. This is a CTS stiffener, by AY McDonald. I've used these, but now I use Ford ones: