Measurements: Length: 5 1/2" Outside Diameter: 6" Top Opening: Handle Bottom Opening: 1 1/2" MPT Threaded, Male Thread SQ FT Media: 20' Popular brand part numbers: Unicel - 6CH-25 (6CH25) Filbur - FC-0305 (FC 0305) Pleatco - PTL20W-SV-P4-4 (PTL20W-SV-P4-4) Also replaces the following filters: Softub and other manufacturers Softsider Spas Leisure Bay Spas Dolphin Spas Alternative filter names: 90-802 17-175-1008 090164020303 PTL20W-SV-P PTL20W-SV-P-4 Manufacturer of this cartridge: Guardian Filtration Products (USA) Part number H05-205 Feel Free to call 724.646.0450 pricing on: Large quantity discount Other cartridge sizes