How To Measure Pipe Fittings. It has two port connections, one being the suction and the other being the return, which can be rotated 360 degrees.both these ports have plumbing attached to them via connection of a union or quick disconnect. Similarly, a thread that measures 1 is actually a 3/4 bsp thread.
Find figure nearest this dimension in column 1 or 2 of chart. Pipe size (npt) outside diameter. Wrap a string around the pipe.
With the information you’ve obtained, you should be able to identify what type of fitting you’re looking at.
For example, if you count 3.5 thread crests over 1/4: For example, if you count 3.5 thread crests over 1/4: Identify the kind of pipe. Note that a thread that measures 1/2 is not a 1/2 bsp thread.