Step 6 · Install New Manifold and PEX Lines
Find a suitable location and use a drill to securely mount the new PEX manifold to a wall or backing board. Using a pipe cutter, cut the main hot and cold copper lines and install the PEX-to-copper transition fittings. Apply teflon tape to any threaded connections before tightening with a pipe wrench. Connect the manifold inlets to these transition fittings. Now, begin running the individual PEX lines. Pull a red PEX tube from the appropriate hot water port on the manifold to a hot water fixture location (e.g., kitchen sink hot side). Repeat with a blue PEX tube for the cold side. Continue this process for every fixture. As you run the tubing, use a drill and PEX pipe clamps to secure the tubing to joists or studs every 32-36 inches to prevent movement and noise.