Step 5 · Connect Filter to Water Line
Examine the new filter cartridge and locate the arrow indicating the direction of water flow. This arrow must point towards the refrigerator. Take the water line coming from the supply valve and insert it into the 'IN' side of the filter. Push the tubing in until it bottoms out. Slide the ferrule and nut up to the filter's threaded port and hand-tighten the nut. Now, take the water line going to the refrigerator and connect it to the 'OUT' side of the filter in the same manner. Using two adjustable wrenches—one to hold the filter body steady and the other to turn the nut—tighten each compression nut an additional 1/4 to 1/2 turn past hand-tight. Do not overtighten.