Alpine Pure filter housing for 20 inch Full-Flow Big Blue/Jumbo filter cartridges; Made from Food grade materials. Heavy Duty 20" Clear Jumbo with 1" (25mm) ports. Max 100psi. These 20" jumbo housings are used for whole house systems as a single unit or as a twin housing when joined together with 1" nipples and a twin SS bracket. Suitable for all 20" X 4 1/2" filter cartridges. Complete as shown with bracket, Screws, and Spanner. These clear housings are not recommended to be situated in any sunlight as green Algae will grow inside the housing. Please note this filter does not include a filter cartridge.