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  1. There are several ways to connect PEX tubing1234:
    • Push-fit fitting: Uses metal tines to hold the tubing against an O-ring seal.
    • Clamp-ring connection: Connects PEX to existing metal pipe. PEX tubing is crimped onto the male end, and the female end is either soldered or threaded onto existing pipe.
    • Crimp method: The most common connection method used in PEX installation. This process involves sliding a ribbed fitting into the PEX tube and crimping a seal ring around the connection point.
    • Expansion method: Involves expanding the PEX tubing and then inserting a fitting. The tubing will contract around the fitting, creating a tight seal.
    • Expansion with compression method: Similar to the expansion method, but uses a compression sleeve to secure the fitting.
    Learn more:
    A push-fit fitting uses metal tines to hold the tubing, in this case PEX and copper, against an O-ring seal. The fittings are sized by the tubing’s outside diameter. A clamp-ring connection connects PEX to existing metal pipe. PEX tubing is crimped onto the male end, and the female end is either soldered or threaded onto existing pipe.
    www.finehomebuilding.com/2009/03/26/how-to-ma…
    The most common connection method used in PEX installation is the “Crimp” method. This process involves sliding a ribbed fitting into the PEX tube and crimping a seal ring around the connection point. These rings are typically made of copper, but may be found in plastic as well as brass.
    www.pexuniverse.com/pex-connection-methods
    Plus, connecting a PEX system is relatively easy to learn and quick to install. Learn about the five PEX connection methods — crimp, clamp, push-to-connect, expansion and expansion with compression — and hear about the pros and cons of each to determine which fitting system will work best for your future piping projects.
    www.phcppros.com/articles/12240-the-pros-and-co…
    There are two parts to this transition: the PEX-A MIP adapter and the PEX-B FIP adapter. These parts will thread together and allow you to join PEX-A to PEX-B. The PEX-A side will require an expansion ring while the PEX-B side requires the crimp ring. This method will also require using pipe dope and tape to ensure the seal is good.
    willplumb.com/how-to-connect-pex-a-to-pex-b/
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