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As far as I could tell, Sharkbite only makes one fitting, the transition one, to go from polybutylene to pex, copper, or cpvc. Similar to a compression fitting, pex and polybutylene both require a stiffener of the right size to work right - it also helps to keep the fitting aligned with the pipe to keep stress and movement out of the seal.
I recently replaced a leaking plastic fitting on Polybuteline pipe with a sharkbite fitting. This is the second plastic fitting to leak in this past year so...
I have never seen any indication that Sharkbites are approved for use with polybutylene. They are for use with copper, CPVC, and PEX. The problem, as I see it, is that the inside diameter of the PB pipe is larger than PEX.
You can use a 1/4 turn stop valve with a Shark-Bite connection to the pipe. These 1/4 turn valves are very popular for shut offs because these valves should always either be fully off or fully on.
Mar 14, 2021. #2. Yes. You can use one of the things on https://www.sharkbite.com/products/brass-crimp with PEX-A, but you can also use the Sharkbite push-on connectors, which you are probably thinking of.
I see the company promotes that SharkBites work with CPVC, PEX, and copper. I believe PEX has same pipe dimennsions as PB and CPVC, so it sounds as if it the SharkeBite should work as a temp connection between the CPVC and PB for each day of work until the replumb has been completed.
For simplicity I'd like to use a couple of 1" MPT x 3/4" Sharkbite reducer/adapters, if I could depend on them to last. Or is the "right way" to use a couple of unions (with nipples, and reducer couplings etc) because they would be less likely to ever be a problem?
Nope... Just the opposite. ( At least on Sharkbite ) From the website : Transition from polybutylene to PEX pipe. Includes two color coordinated crimp rings – the black crimp ring is for PEX pipe, while the copper-colored crimp ring is for polybutylene pipe. Certified for use in potable water and hydronic heating systems.
PEX fittings are not the same as polybutylene fittings. If you want to save the valve, you can heat it up, and pull the fitting out, wipe it clean and sand it, flux, install and solder in the new one. Or If you really don't want to work too hard, pick up a replacement ball valve with Sharkbite fittings.
The same size PB, copper, CPVC, PEX and galvanized can all be connected together with QEST gray plastic compression fittings, or I suspect Shark bite fittings too. I.E. 3/4" PB to 3/4" galvanized to copper to CPVC to PEX and back to the PB.