Length: 21-5/16"Diameter: 5-3/8"Top opening: 2-1/8"Bottom opening: 2-1/8"   Replaces popular brand part numbers: Unicel C-5396 Filbur FC-2975 Pleatco PCST80  Features: 80 sq. ft. of high-quality filtration fabric Exclusive Expansive Flow™ core Alternative filter names: 817-0098, Coast Spas 100,17-175-3660, APCC7440, 19932, APCC7440M, 090164824703, SD-01250, PCST 80, PCST80-Z, PDC540-AFS Used in pools/spas made by: Coast Spas, Waterway Plastics & other manufacturers   By Guardian Filtration Products • 521-223-01