Length: 17-3/4"Diameter: 5-5/16"Top opening: 2-1/8"Bottom opening: 2-1/8"   Replaces popular brand part numbers: Unicel C-5397 Filbur FC-2972 Pleatco PLBS100 Features: 100 sq. ft. of high-quality Filtration Fabric Exclusive Expansive Flow™ core Break-resistant Guardian banding Alternative filter names: 817-0016, 303434, R173601, S2 Spa, G2 Spa, AK-40083, AK40083, 17-175-2203, APCC7293, 19930, APCC7487, PLBS100, PLBS 100  Used in pools/spas made by: Leisure Bay Spas, Pentair Pool Products, QCA Spas, Rainbow Plastics, Rec Warehouse, Waterway Plastics & other manufacturers   By Guardian Filtration Products • 517-223