Guardian ANTIMICROBIAL SINGLE filter relpaces- unicel 4CH-24 Pool Filter 25 Sq Ft filbur FC-0131 Pleatco,PGS25P4 MICROBAN, ANTIBACTERIAL Replaces Unicel 4CH-24RA, Pleatco PGS25P4-M, Filbur FC-0131M Length: 9-3/4", Diameter: 4-5/8", Top: Handle, Bottom: 1-1/2" MPT threaded 25 sq. ft. of antimicrobial filtration fabric (equivalent to Microban antimicrobial product protection) Alternative filter names: 20254-238, 17-175-1265, APC 12519, 212321, 17-175-1264, 373005, PTL 20HS W/ PAD, PTL20HS W/ PAD AD, PTL 20HS, PGS25 W/ PAD, PTL20HS-P4, PAQ25N, PAQ25-N Antimicrobial end caps