Step 7 · Connect New Water Supply Lines
Attach the faucet's integrated hot and cold supply lines to the corresponding shutoff valves. The hot line is typically marked with a red indicator and connects to the left valve. The cold line is marked blue and connects to the right. Screw the connection nuts on by hand until they are finger-tight. Then, use an adjustable wrench to give them an additional quarter- to half-turn. Be careful not to overtighten, as this can damage the gaskets inside the fittings and cause a leak.