Polyethylene vs polybutene pipe?

Old 07-10-16, 07:08 PM
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Polyethylene vs polybutene pipe?

The pressure tank I have has poly pipe on both the entrance and exit.
I want to transition the exit for one of the branches to 1/2 pex. The rest of the house is copper.
I have a 1/2 pb x 1/2pb x 1/2 pex tee worth rings.
But it seems to small somehow.
Is black polypipe different to polybutylene?
Old 07-10-16, 07:49 PM
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Black poly pipe is neither polybutylene nor PEX and can't be used with those fittings.
Old 07-11-16, 03:45 AM
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The pex on this tee is for pex pipe.
I'm looking for a tee to join polypipe to polypipe but then branch off to pex.

Or would it be better to have pex come out of the pressure tank then join to copper?
Old 07-11-16, 05:50 AM
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Black Poly pipe is used with barbed insert fittings and hose clamps. They look a bit like pex but are different. You could use a combo tee like this example: http://www.menards.com/main/polypipe...4431306082.htm

(That's just an example, may not be the correct size for you)

And then screw in a threaded pex adapter to make your PEX transition.

IIWM, I'd go to Pex at the pump tee and use a sweat or threaded adapter to make the transition to copper, with a PEX tee in between for your PEX run.
Old 07-11-16, 06:12 AM
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Originally Posted by qwertyjjj
". . . Is black polypipe different to polybutylene? . . ."
The use of polybutylene for any domestic potable water systems is frowned upon as there was a major Class Action Lawsuit in the 1990s due to its failure to remain pliable (they became brittle) with chlorinated water, especially chlorinated water which had been heated.

Here in the States, I think Shell Oil settled that suit for over $1,000,000,000, and polybutylene piping was removed from millions of recently built homes (1970s and 1980s) . . . . especially Mobile Homes.

As a Real Estate Broker, we had to recognize, and disclose, the presence of any polybutylene piping to prospective Buyers before allowing them to enter into any Purchase and Sales Agreement.

So no; polyethylene and polypropylene is not the same as polybutylene. It was in the papers.

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