COMPATIBLE WITH ANY 10" x 2.5" standard sediment or carbon filter cartridge. ELIMINATE THE NEED FOR EXTERNAL SHUT-OFF VALVES - the internal valve-in-head allows both inlet and outlet ports to be simultaneously shut off with a turn of the handle. PRESSURE RELIEF BUTTON on the inlet side to relieve pressure inside the housing when changing filter cartridges. RADIAL SEALING O-RINGS AND SEALING SURFACES are continuously cleaned each time the valve is used, ensuring leak-proof operation. CLEAR SUMP HOUSING offers on-site examination of flow, cartridge life and performance. Additional Details ------------------------------ Product description: COMPATIBLE WITH ANY 10" x 2.5" standard sediment or carbon filter cartridge. ELIMINATE THE NEED FOR EXTERNAL SHUT-OFF VALVES - the internal valve-in-head allows both inlet and outlet ports to be simultaneously shut off with a turn of the handle. PRESSURE RELIEF BUTTON on the inlet side to relieve pressure inside the housing when changing filter cartridges. RADIAL SEALING O-RINGS AND SEALING SURFACES are continuously cleaned each time the valve is used, ensuring leak-proof operation. CLEAR SUMP HOUSING offers on-site examination of flow, cartridge life and performance.