Independent Supplier & Replacement Part Notice

We are an independent parts supplier and are not affiliated with, sponsored by, or endorsed by Watkins, Hot Spring, Caldera, Tiger River, or Solana. These names and their part numbers are used only to identify compatibility.

We offer replacement parts as alternatives to spa-branded parts. When this listing identifies a part as the same original-manufacturer replacement, it is supplied under the component manufacturer’s branding and part number, which may differ from the Watkins or spa-brand label and number. Other compatible alternatives are identified in the individual product listing. Please review the listed specifications, fitment details, and any installation differences before ordering.

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