The Plumber's Choice 1/2 in. Straight Coupling Pipe Fittings Push to Connect PEX Copper CPVC Brass (5-Pack) 125UPSC - The Home Depot
WMAXPFIT PEX Pipe Fitting 1/2 inch Set, Brass Push Fit Fitting 1/2 inch Set with 90 degree elbow, tee & coupling, push to connect for quick connection to PEX Tube Pack of 12 - Amazon.com
PEX-A
How to Install PEX Tubing with Quick Connect Fittings