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...
Rainbow 50 Sq Ft Filter 40505 M4306 Diameter: 4 15/16"Length: 6 5/8" Center hole This is for a stack of 2x 6 5/8 inch long filters that makes up the complete 50 sqft filter set