Pentair 140243 Triton II Side Mount Fiberglass Sand Pool Filter, 7.06 Square Feet, 141 GPM (Residential), without Valve or Unions Heavy-duty closure provides easy inspection, and features an easy-to-read pressure gauge with air relief valve, Valves must be purchased separately. Swing-away diffuser allows instant access to sand and all internal parts All internal parts are threaded for ease of service Internal air bleed.Effective Filtrtation Area (Sq Ft):7.06 Bulkhead connectors are threaded for easy installation and service Combination sand and water drain makes servicing and winterizing fast and easy Maximum Operating Pressure 50 psi