PRICES MAY VARY. 【Certified Quality & Safety】 POOLPURE Pool and Spa filter proudly hold the NSF/ANSI 50 certification, tested and verified by IAPMO. Trust in POOLPURE to provide crystal-clear, purified water, enhancing your overall pool or spa experience. Dive into unmatched relaxation. 【Specifications】Length: 4"; Outer Dimension: 4 1/4"; Top: 2 1/16" open; Bottom: 2 1/16" open. Filtration Area:10 sq. ft.; Filter Material: Trilobal Filtration Fabric. 【Compatibility Details】Designed to fit models