If you need to connect metal shutoff valves to plastic pipes, use these instructions to do it without professional help.
Step 1 - Prepare the Plastic Pipe
Wipe both ends of the plastic pipe on the inside and outside with a cloth. Make sure it is completely dry.
Step 2 - Apply the PVC Cement
Apply the plastic pipe cement on both the PVC and the adapter. Use the dabber that comes with the cement and apply a liberal amount around the inside of the pipe. Slip the pipe into the adapter.
Step 3 - Install the Plastic Pipe
Insert the end of the PVC pipe to the end of the adapter. Push the plastic pipe into the adapter and make a twist inside. This will mesh the cement and bond the pipe and adapter together.
Step 4 - Apply Teflon Tape
Put three layers of the Teflon tape on the other end of the adapter. Put it on the threaded inside and smooth the tape with your fingers.
Step 5 - Install the Shutoff Valve
Attach the threaded end of the adapter to the shutoff valve by screwing it in.
Step 6 - Tighten the Shutoff Valve
With the crescent wrench, tighten the valve into the adapter. To avoid damaging the adapter, do not over-tighten shutoff valves.