Length: 10-1/2" Diameter: 5-7/8" Top opening: 1-15/16" Bottom opening: 1-15/16"     Built to meet OEM specifications, the Guardian 610-124 is features: 30 sq. ft. of high quality filtration fabric Exclusive Expansive Flow™ core Replaces popular brand part numbers: Unicel C-6430 Filbur FC-3915 Pleatco PWK30 Alternative filter names: 31489, 73178, Tri-X, 71825, 75041, 0969601, APCC7095, 13004, PKW30, APCC7095M, SD-01242, 090164824000, PWK 30, PDC510-AFS Used in pools/spas made by: Hot Spot Spas, Hot Springs Spas, Hydro Pool Industries, Serenity Spas, Solana, Solona, Watkins Mfg. & other manufacturers   By Guardian Filtration ProductS • 610-124