· Compatible with PRB50-IN, C-4950, Guardian 413-212-02, FC-2390, 03FIL1600, 17-2380, Aladdin 15002, 03FIL1600, 817-5000, 435-0037, R173434, 06-0012-12, 6540-471, J210/ J220/ J235/ J245/ J275 5X13 Drop in Hot Tub Filter· SPECIFICATIONS: Length: 13 5/16”; Outside Diameter: 5”; Top Hole: 2 1/8” Open; Bottom Hole: 2 1/8” Open; Filtration Area: 50 sq. ft.· Can use your filter cartridge for a longer time---The advanced and qualified material of trilobal fibers makes water filtration more thoroughly and using life longer.· If any question,pls contact us.