Step 5 · Install the New Expansion Tank
Use a clean rag to wipe the female threads on the pipe tee, removing any old Teflon tape or debris. Carefully lift the new expansion tank into place. To prevent cross-threading, start screwing the tank into the fitting by hand. You should be able to get several rotations before it becomes snug. Once it is hand-tight, place one pipe wrench on the fitting at the base of the new tank and your second 'hold-back' wrench on the pipe tee. Tighten the tank clockwise an additional one to two full turns. The connection should feel very snug, but do not overtighten, as this can crack the fittings.