Guardian Antimicrobial Spa Filter Replaces Unicel C-5374RA, C-5374, Filbur FC-2971, FC-2971M Pleatco PLBS75, PLBS75-M Replaces Unicel C-5374, Filbur FC-2971, Pleatco PRB-S-75 Measurements: Length 14-13/16", Diameter: 5-5/16", Top Opening: 2 1/8", Bottom Opening: 2 1/8" 75 sq. ft. of antimicrobial filtration fabric (equivalent to Microban antimicrobial product protection) Antimicrobial end caps