This filter is found only in Sundance Hot Tubs that is 19" long x 8 1/2" Wide and it has a hole in one end that is 2 1/2" that slips over a fitting with a nut ti tighten it into place and a nipple on...
This part is a Sundance Spa Filter Cartridge that is 125sqft, crown with a step, It features a 2-1/2" Hole in One End Only and is 8-1/2" Wide X 18" to 18 1/2" Long..
Application ...