Pleatco Filter with Free-Flow Core Technology for the purest water quality and durability Replaces OEM Filter Brands and Part Numbers: STA-RITE INDUSTRIES Models: POSI-FLO TX135, TX-135, T-135TX Sta-Rite Replacement Part Numbers: WC108-59S2X, WC10859S2X Measurements: Length: 34-1/2" Outside Diameter: 8-7/8" Top Opening: 4-1/8" Bottom Opening: 4-1/8" # Total Sq. Ft. 135 Other popular brand part numbers Unicel Filter - UHD-SR135, UHDSR135 Filbur - FC-2560, FC2560 Aquakleen - AK-8021, AK8021 Manufactured by Pleatco, guaranteed highest quality or your money back Pleatco Part number: PSR135-4, PSR-135-4 UPC Code: 090164135007