Relax and leave the reliability to us. Fit your pump with our  oil sight glass by PK Machine  Our oil sight glass will provide constant bearing oil inspection to reveal contamination of dirt, grit and water in bearing oil.

What oil sight glass size do I need? Oil sight glass size refers to physical dimensions, but the standard for size is not always as straight-forward as measuring the pipe. We can all chuckle about the sizing question and we are asked all the time how to measure.

Measuring the pipe can be misleading.
A ¼" NPT has an inside diameter of ¼” and an outside diameter (OD) of 1/2” (.50)
A 3/8” NPT has an inside diameter of 3/8” and an outside diameter of 5/8” (.625)
A ½” NPT has an inside diameter of ½” and an outside diameter of ¾” (.75)
A ¾” NPT has an inside diameter of ¾” and an outside diameter of 1” (1.00)
Whether you hang it on your tree or hang it off your pump, remember the original oil sight glass by PK Machine are the original and the best.