A frequently asked question is that with so many choices and sizes of control valves that range from 3/4 of an inch all the way up to 3 inches or larger, “how do I know what size valves to get?”.

Valve Sizes Vary Depending On Pipe Size

Valve size is significant and you want to choose a valve that is the same size or larger than the pipe you are connecting it to. If your mainline pipe is one inch in size I recommend using a one-inch valve. If your mainline pipe is 3/4 of an inch I suggest using you got it a valve with a 3/4 of an inch size inlet and outlet. If you want the features of a valve that is only available in the standard one-inch size and not in a 3/4 of an inch size you can always use fittings that allow you to attach the inlet and outlet of the valve to the smaller pipe without any issues.

If your mainline pipe is larger than 1 inch you are going to want to use the same size valve as the pipe size you are using. You should always match the valve size to the pipe size.

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