Step 3: Solder on a new shut-off valve

new shutoff valve
Photo: Kolin Smith
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Fit a ½-inch ball valve to two pieces of copper tubing and a female adapter, as illustrated at far left.

Solder the assembly together before installing it under the sink, for maximum safety. Work from the bottom up, first soldering the copper tubing to the ball valve, then the ball valve to the next bit of tubing, and finally the tubing to the female adapter.

Fit the assembly onto the tee fitting coming off the cold-water supply with a 90-degree elbow. Solder both ends of the elbow in place.

Wrap Teflon tape around the reducer fitting and thread it into the top of the female adapter. Hold the adapter with pliers while tightening the reducer with a wrench.

Tip: Be sure the ball valve is open when soldering so that steam can escape.
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    Tools List

    • drill
      Drill/driver with step-drill bit,
      to drill hole in sink top
    • propane torch
      Propane torch
    • emery cloth
      Emery cloth,
      for cleaning pipe prior to soldering
    • adjustable wrench
      Adjustable wrench
    • tongue-and-groove pliers
      Tongue-and-groove pliers
    • tubing cutter
      Close-quarters tubing cutter
    • basin wrench
      Basin wrench,
      to tighten hex nut that holds filter faucet to sink top
    • copper fitting brush
      Copper fitting brush (for cleaning copper tubing and fittings
    • 16-foot tape measure
      Tape measure
    • eye goggles
      Eye goggles
    • centering punch
      Center punch,
      to strike a starting point on stainless steel sink deck prior to drilling

    Shopping List

    1. WATER FILTER KIT

    2. LEAD-FREE SOLDER AND PIPE FLUX

    3. 1/2-INCH COPPER TEE

    4. SEVERAL FEET OF 1/2-INCH COPPER TUBING

    5. 1/2-INCH FEMALE ADAPTER

    6. 1/2-INCH TO 1/4-INCH REDUCER

    7. 1/2-INCH BALL VALVE

    8. TEFLON TAPE

    applied to reducer before threading onto female adapter



    9. TARP OR BLANKET

    to protect kitchen floor



    10. FIRE-RESISTANT CLOTH AND FIRE EXTINGUISHER