Lifegard AF-94 Mecanical Filter Modules, Single Capacity 0-30 PSI/Bar Dial Pressure Gauge indicates when to clean cartridge and manual Air Bleed eliminates unwanted trapped air Cartridge traps particles from 20 microns down to 5 microns; Inner pleat supports prevent pleats from squeezing shut providing longer filter cycle Internal chamber holds 3-ounce (86-grams) of Lifegard Pelletized Carbon; Will also hold a variety of chemical or biological filter media Inlet Port 1-1/4-inch Slip/3/4-inch FPT; Outlet Port 1-inch Slip/3/4-inch FPT; Port size dimensions listed are pipe size; SLIP equal to PVC solvent socket type fittings All Lifegard Mechanical, Chemical, Heater, and UV Sterilizers include 3/4-inch threaded reducing bushings if threaded installation is desired