Length: 17-3/8"Diameter: 8-1/2"Top opening: 4"Bottom opening: 4" Built to meet OEM specifications, the Guardian 817-150 features: 75 sq. ft. high-quality Filtration Fabric Exclusive Expansive Flow™ core Break-resistant Guardian banding Replacement for popular brand part numbers: Unicel C-8600 Filbur FC-1280 Pleatco PA80 Alternative filter names: CX800-RE, C-800RE, Hayward C-800, Hayward Star-Clear II C800, Hayward Star-Clear II C1500, 17-175-1330, APCC7227, 17507, SD-00547, 090164800042, PA80-4, PA 80   Used in pools/spas made by: Cal Spas, Hayward & other manufacturers   By Guardian Filtration Products • 817-150