50 Sq Ft Rainbow Waterway 40506 C-4950 4-15/16" diameter 13-5/16" length 2-1/8" open top 2-1/8" open bottom 50 SQ. FT This filter is one of the most popular filters used in a wide variety of hot tubs...
25 Sq ft Rising Dragon Filter 4CH-926 is 13 1/2 inches tall and 4 5/16" wide. This filter has 2 inch female SAE threads on the bottom and a handle on top.