SharkBite Brass 1/2-in Push-to-Connect x 3/8-in OD Compression Quarter Turn Straight Valve. SharkBite push-to-connect stop valves are the fastest way to connect to PEX, copper, CPVC, or PE-RT stub outs. These valves control the flow of water to plumbing fixtures including faucets, toilets, dishwashers, washing machines, and ice makers.