SharkBite Max, 1/2" Compression x 3/8" Compression Brass Shut Off Valve. Stainless steel collar. Sleek chrome finish. Used to control and shut off water flow to fixtures or appliances for maintenance and repair. Innovative design with 1/2 in. push-to-connect inlet makes for quick installation and quarter-turn, full-port brass ball valve makes for easy operation. Faster install time and ease of use reduces installation errors. The supply stop valve is compatible with any combination of copper, PE-RT, CPVC, and PEX pipes, and is composed of brass with a sleek chrome finish for an attractive aesthetic.