Length: 13-5/16"Diameter: 4-15/16" to 5"Top opening: 2-1/8"Bottom opening: 2-1/8"     Built to meet OEM specifications, the Guardian 413-212 features: 50 sq. ft. of high quality filtration fabric Exclusive Expansive Flow™ core Break-resistant Guardian banding Compatible replacement for popular brands: Unicel C-4950 Filbur FC-2390 Pleatco PRB50IN For use in pools/spas by: Sunset Spas, Islander Spas, Dynasty Spas, Honey Tubs, Aqua Mystic, Bullfrog Spas, Southwest Spas, Spa Crest, Spas Direct, Rubadub Tub, Coast Spas, Rainbow, Waterway Plastics, Custom Molded Products, Tiara Spas, Discovery Spas, Pageant Spas, Icon Spas, Morgan Spas, J.E.M. Spas, Coast Mountain Spas, Gatsby Spas, Columbia Spas, Arcadia Spas, Blue Pacific Spas, Freedom Spas, Apollo Spas, Marathon Spas, Alps Spas, Sun Coast Spas, Baja Spas, Sundance Spas, Charisma Spas, Infinity Spas - TN, Leisure Bay Spas, Strong Industries, Aber Hot Tubs, Wind River Spas, Zone Spas, Sun West Spas, Blue Falls Mfg. Ltd., Maax Spas of AZ, US Spas, Beachcomber & more   By Guardian Filtration Products • 413-212