Step 10 · Connect Water Supply Lines
Connect the hot and cold flexible water supply lines from the faucet tails to the corresponding angle stop shutoff valves under the sink. The hot is typically on the left, and cold is on the right. Tighten the compression nuts by hand, then use an adjustable wrench or a basin wrench for the final half-turn. A basin wrench is specially designed for reaching the faucet connections in the tight space behind the sink.