How To Measure Pipe Fittings. Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference) divide the circumference by 3.14159; Measure the outside diameter of the large portion of the thread at a;
For pvc pipe measure the outer diameter, for the fittings measure the inner diameter. The thickness of the pipe wall will vary depending on the pipe, so always take that into account. Something that you can do specifically with copper pipe is to measure it by getting one pipe and inserting it into a fitting and then marking one of the ends.
The threads are deeper at the end of the pipe and shallower at the base (moving away from the end of the pipe).
For pvc pipe measure the outer diameter, for the fittings measure the inner diameter. Also referred to as pumps, is the plastic molded housing that is mounted at the end of the motor. In our industry, pipes and tubing are sized in two ways: For pvc pipe measure the outer diameter, for the fittings measure the inner diameter.