This is a generic hot tub filter cartridge made by Pro Aqua. This is a cheaper alternative to Unicel or Pleatco but still a very high quality filter for a lower price.
75 Sq ft. Length 14-13/16".
Diameter 5-5/16".
Open holes on each end measuring 2-1/8".
Replacement filter for Maax, California Cooperage and other brands.