Tightening the compression fitting.
Photo: Kolin Smith

Step 6: Tighten the compression fitting

When tightening the compression nut on the supply line, stop turning just when it begins to draw tight. Then, place a second wrench on the small nut located just above the compression nut, and give the compression nut one last quarter turn. This two-wrench approach will keep the supply hose from turning and twisting as you tighten the compression nut.

Tip: Never use Teflon tape, Teflon paste, or other chemicals on compression threads, as they can lubricate the fitting and cause a leak.
Ask TOH users about Kitchen Sinks

Contribute to This Story Below

    Tools List

    • bucket
    • basin wrench
      Basin wrench
    • adjustable wrench
      2 adjustable wrenches
    • flathead screwdriver
      Flat-head screwdriver

    Shopping List

    1. FAUCET

    Usually comes with everything necessary for installation, except braided supply lines.


    Needed to connect faucets that have rigid tubing.


    if necessary, to cover holes in the sink rim or the countertop when replacing a three-hole faucet.