This replacement filter fit into spas made by: 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 Spas, PDC Spas, Pentair Pool Products -Rainbow Plastics, QCA, Rec Warehouse, River Valley Spas, Royal Spas, Rubadub Tub, Safari Spas, Signature Spas, Spa Manufacturers Inc., Streamline Spas, Sun Ray Spas, Thermo Spas, US Spas, Viking Spas, Water's Edge Spas, Waterway Plastics, Zone Spas