Popular 25 square foot drop in filter used in many makes and models of spas and hot tubs. 5" Overall Diameter, 13-5/16" Length, 2-1/8" hole in top and bottom.

AKA/Replaces: 817-2500, M-4326, R173429, 100586, 17-2327, 25392, 303909, 33521, FC-2375, C-4326

Used in: Dynamic Series I RDC-25, I RDC-25S, Dynamic Series II & II RTL/RCF-25, Dynamic Series IV-DFM, DFML, Waterway 25 In-Line, Custom Molded Products, Accent Spas, Acryx-Maax Spas ,Apollo Spas , Aqua Mystic Spas, Beachcomber, Blue Falls Manufacturing Ltd., Coast Mountain Spas, Coleman Spas, Custom Molded Products, Dakota Spas, Emerald Spas, Endless Pools, Freestyle Spas, Futura Spas, Great Lakes Home & Resort, Hawkeye Spas, Honey Tubs, Hot Spot, Hot Spring Spas, Hydropool Industries, Islander Spas, Jacuzzi Premium, Leisure Bay Manufacturing, Moonwater Spas, Nordic Hot Tubs, Onyx Water Products, Orca Bay Spa, PDC Spas, Pentair Pool Products, QCA, Rec Warehouse, River Valley Spas, Royal Spas, Rubadub Tub, Safari Spas, Signature Spas, Spa Mnufacturers Inc., Streamline Spas, Sun Ray Spas, Thermo Spas, US Spa , Viking Spas, Water's Edge Spas, Waterway Plastics, Zone Spas