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Drop ear elbows solve a common PEX headache: giving a fitting something solid to mount to so it doesn't flex or leak at the connection. This BestPEX elbow has a three-ear flange you can screw to a stud or backing board, with a 1/2" barb on one side for PEX tubing and a 1/2" female pipe thread on the other for a faucet or valve.
A crimp ring or clamp is sold separately, so have one on hand before you start the install.