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How can you determine the nominal orifice size of the following sprinkler: Small orifice frame style “Model M” sprinkler with a pintle?

April 26, 2017determine frame nominal orifice size small sprinkler

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How can you determine the nominal orifice size of the following sprinkler: Small orifice frame style “Model M” sprinkler with a pintle?

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Look inside the threaded end of the sprinkler. If it has a three stepped bushing, it has a 3/8″ nominal orifice. If it is bushed with a smoothed bored taper, it has a nominal 7/16″ orifice.