Pleatco Filter with Free-Flow Core Technology for the purest water quality and durability Replaces OEM Filter Brands and Part Numbers: Coleman Spas: 3301-2111, 100522 Apollo Spas: 3301-2111, 100522 Measurements: Length: 14-13/16" Outside Diameter: 7-1/16" Top Opening: Handle Bottom Opening: F2M 2" Male Adapter Fitting NPT Total Sq. Ft. 50 Other popular brand part numbers Unicel Filter - 7CH-502, 7CH502 Filbur - FC-0460, FC0460 Aquakleen - AK-9025, AK9025 Manufactured by Pleatco, guaranteed highest quality or your money back Pleatco Part number: PCS50-F2M, PCS50F2M UPC Code: 090164540009