Which seems to be considered better when using gate valves and true unions?
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Thanks for the reply and the linkI personally prefer threaded. I use a thread to slip adapter right out of the valve. That way, if you need to make a change, you can take the threaded fitting out and reuse the valve. Just my $.02.
http://www.pvcfittingsonline.com/fittings/schedule-40-pvc/adapters/male.html?size_in_inches=36