Lifegard AF-93-19 Chemical Filter Modules, Double Capacity Double Capacity for Aquariums up to 200 gallons Removable chamber allows easy media replacement and pre-rinsing; Carbon can also be easily pre-rinsed while inside chamber Double capacity holds 15;6-ounce (442 grams) Lifegard Pelletized Carbon 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