- 1). Turn the water off at the main shutoff valve. Open the lowest faucet in the house to drain the pipes. Measure and mark the Quest pipe four inches (or more) away on each side of the shutoff valve. Cut though the pipe at both marks using a tube cutter and discard the valve.
- 2). Remove the nuts on the ends of two adapter couplings, then take off the steel crimp fittings and acetal compression sleeves (found between the nuts and coupling body). Push a nut onto the end of each Quest pipe, followed by a crimp fitting and compression sleeve. Push a coupling body onto each pipe end and screw the nut onto each body by hand. Tighten each nut to the coupling body using a crescent wrench.
- 3). Measure and cut two sections of CPVC pipe roughly six inches or longer (use the tube cutter). Apply PVC primer around one end of both pipes. Also prime the inside ends of a CPVC shutoff valve. Apply PVC cement to all primed areas and push the pipe ends into the ends of the valve. Hold the pipes to the valve for 10 seconds for the cement to dry.
- 4). Position the new valve and CPVC pipes against the existing Quest pipes and mark each CPVC pipe in the place where it will connect to each adapter coupling (calculate for how much the pipes will enter into the end of each coupling). Use the tube cutter to cut both CPVC pipes at the marks.
- 5). Push one of the remaining adapter coupling's nuts onto each end of the CPVC pipe, followed by a crimp fitting and compression sleeve. Push the ends of the CPVC pipes into the body of each adapter coupling and screw each nut to the coupling. Tighten the nuts to the couplings using the crescent wrench. Turn on the water supply and turn off the new CPVC shutoff valve.
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