What size are pool pump fittings?
What size are pool pump fittings? 99% of pool pumps use either 1.5″ or 2″ pipe and connectors, a size that is fairly easy to find. We also sell a few pool plumbing fittings in our online store. If you’re unsure what pipe size you have, note that 1.5″ Schedule 40 PVC pipe has an outer diameter of 1-7/8″, and an inner diameter of 1-1/2″.