My special guest today is Chris Sinsel, inventor of Efficient Fittings, the universal sprinkler fitting.

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"You know, I wanted to make something universal, and I needed something for a 3/4" sprinkler head and a 1/2" sprinkler head. So I was taking measurements because, and I screwed a 1/2" sprinkler head onto a fitting completely tight and went to take measurements. I realized you only use approximately half the threads on that fitting. And for some reason I just had this idea that I wonder if I could fit that 1/2" threaded portion into a 3/4" inch sprinkler head and see if that worked."