PEX-B on Poly-B fittings

Over 698,000 strictly plumbing related posts

Plumbing education, information, advice, help and suggestions are provided by some of the most experienced plumbers who wish to "give back" to society. Since 1996 we have been the best online (strictly) PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't tract you. We absolutely do not sell your personal information. We are made possible by:

Post New

How to Show Images

Newest Subjects

PEX-B on Poly-B fittings

Author: JImbob568 (OR)

Hey all,

I am a DIY guy in the middle of changing my home from 1994 Poly-B pipe to PEX-A. I opened up the back of the tub/shower wall and found a valve that was all solder joints. So, there's Poly-B fittings soldered to the valve.
I had planned for threaded connectors. I read one blog that you CANNOT use PEX fittings with Poly Pipe, but it is OK to use PEX pipe on Poly-B fittings. Do you agree? I doubt that it would work with expansion PEX-A, but maybe Pex-B with the stainless compression clamp? If so, I should be able to remove the crimp ring, slide the Poly off, then clamp a PEX pipe to it. That would save a ton of work. I have uised PEX-A throughout the project but could live with a couple compressions clamps with the amount of work it would save.

Any thoughts would be appreciated!

Jim

Post Reply

Re: PEX-B on Poly-B fittings
Author: NP16 (OR) Delta and others make new and affordable valves with 1/2" expansion adapters built right in. I would suggest a new valve and new trim.
Post Reply

Re: PEX-B on Poly-B fittings
Author: bernabeu (SC) ditto the wall is open replace and sleep well ============================================== "Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Post Reply

Please note:

Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Plbg Advisor List Common Plumbing Terms Find A Plumber Plumbing Manufacturers Directory theplumber.com

Special thanks to our sponsor:

to FAQ's - to popular subjects - to plumbing books - to Tankless 101 - to plumbing history - to helping charities - to contact us