These replacement parts for the ProEco CPF Series Filters. The CPF Series pressure filters remove particulate and debris through a pressurized filtration process, and include a built-in ultraviolet clarifier.Parts PT-11 and PT-12 have been recently updated and no longer match parts diagram. Please refer to table below for these parts: SKU Contents Notes PT-11 (3) Sch 40 fittings, (3) ball valves, (1) clear hosetail,(3) female hosetails, (4) nuts, (1) glass disc, (7) rubber gaskets All connection parts that come with filter PT-12 (3) ball valves, (3) rubber gaskets Add ball valves to all three connections PT-12-A (3) rubber gaskets Spare gaskets only PT-12-B (3) Sch 40 fittings, (3) rubber gaskets Connect to 1-1/2" Sch 40 pipe PT-12-C (1) clear hosetail, (3) female hosetails, (4) nuts, (1) glass disc, (4) rubber gaskets Connect to various tubing sizes PT-12-D (1) glass disc, (1) rubber gasket, (1) nut Close off backwash valve