Sharkbite Max Brass Push Check AssemblySharkBite Max check valves are spring loaded and designed to prevent the reverse flow of water. Max check valves can be installed horizontally or vertically. Compatible with PEX, copper, CPVC, PE RT or HDPE SDR 9 in any combination, Max check valves are ideal for working in tight spacecs and can be rotated after assembly. Fastest way to connect PEX, copper, CPVC, PE RT or HDPE SDR 9 pipe.* Half the insertion effort, double the burst pressure.** Can be