Amazon.com: (Pack of 2) EFIELD 3/4 Inch x 3/4 Male Adapter Push to Connect Pex Copper, CPVC, 3/4 Inch, with a Disconnect Tool : Industrial & Scientific
Amazon.com: SharkBite 3/4 Inch x 1/2 Inch 90 Degree Reducing Elbow, Push to Connect Brass Plumbing Fitting, PEX Pipe, Copper, CPVC, PE-RT, HDPE, U274LFA : Everything Else
Apollo 3/4 in. Chrome Plated Brass PEX-B Barb x CPVC CTS Transition Coupling APXCPVC34 - The Home Depot