Step 9 · Connect New Water Supply Lines

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Connect your new (or existing) flexible supply lines to the hot and cold faucet tailpieces. The connections are typically hand-tightened, then given a final quarter-turn with an adjustable wrench. Do not overtighten. Connect the other end of the supply lines to the corresponding hot and cold shutoff valves in the same manner. Ensure the hot line connects to the left side of the faucet and the cold to the right.