What is the difference between Schedule 40
and Schedule 80 PVC
The main difference is the wall thickness. The outside diameter is the same on both the schedule 40 & 80, so they will fit the same fittings. The schedule 40 pipe has a thinner wall and should not be threaded. The schedule 80 pipe can be threaded, and both threaded and scoket fititngs are available for it.
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