Can I connect Poly B to PEX with a SharkBite?
The straight answer
Yes, but only with the dedicated Poly B conversion couplings, sold in 1/2 and 3/4 inch sizes with a grey release collar. Standard push-fit fittings are not certified for polybutylene.
The longer version
Yes, with the right part: the dedicated polybutylene conversion coupling, a brass push-fit with a grey collar on the Poly B end, sold in 1/2″ and 3/4″ sizes. The standard tan-collar push fittings on the same shelf are not certified for Poly B, and that difference is the whole game. The fittings guide covers every rated option, crimp and compression included.
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