Unicel C-4326 replaces Pleatco PRB25-IN filter and the Filbur FC-2375 Features: Free flow cores deliver superior water flow and enhanced filtration highly efficient, spun bonded polyester filter Media Break-resistant bands – keeps the pleats clearly defined and evenly separated for increased water flow Antimicrobial End-caps Built to withstand chlorine degradation Specs: Outer Diameter: 5 "  ( 127 mm ) Length: 13 5/16 " ( 338 mm ) Top Hole: 2 1/8" (54 mm) Bottom Hole: 2 1/8" (54 mm) Square Feet: 25 Part - Unicel C-4326 30 day warranty on manufacturing defects Manufacturer (OEM) : 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