The Aqua Flo CB-5-20 cartridge fits in the following filter housings:
The Aqua-Flo - 5 Micron Carbon Block Filter 20"x 2.5" is a drop-in filter with carbon block media and a 5 micron rating. This carbon block filter effectively reduces the taste and odor of chlorine. This 5 micron filter measures 20 inches in length and 2.5 inches in diameter.
Aqua-Flo - 5 Micron Carbon Block Filter 20"x 2.5" specifications: