"It is assumed that when you state a 1/2"" dia valve, that you mean you have a 1/2"" npt threaded fitting. If that is the case, then you begin by attaching a 1"" pvc to NPT fitting to the pipe (requires pvc cement), and then the connections may be made with a variety of standard NPT fittings. (i.e. reducers or bushings are readily available)."
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