These have 1 1/2" NPT reverse (left-hand) threads on outside of bushing & 3/4" NPT reduced standard (right hand) threads inside the bushing. These are generally used for connection cast-iron radiators that have connections that are left thread.
It allows for reducing a 1 1/2" Left hand male thread connection in the radiator to a 3/4" standard female NPT thread connection.
Specifications
Weight (lbs.) 0.5 lb
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