>>2716050I couldn't find thin walled 3/4" pvc pipe anywhere, it must not get used in cold climates. So I looked at the outer diameter for 1/2" pipe and the inner diameter of a larger pipe with regular wall thickness. I measured the 1/2" OD at 0.839, 3/4" thin walled is 0.93, and 1" PEX is 0.862. So got a piece of 1" PEX and cut out a chunk about 1/4 of the circumference. It snaps onto 1/2" PVC nice and toight. Even with 2 pieces of overlapped 6 mil poly plastic it can still snap in, so it should be perfect to attach the plastic to the greenhouse dome. With plastic between the pipes it is so snug I won't even need to use screws.