Edwin GroothuisPVC pipe sizes are like random number generators:
https://www.bunnings.com.au/holman-15mm-x-1m-pvc-pressure-pipe-class-18_p4750046
Model: PVC Pressure 15mm x 1m Class 18
Actual inside diameter (mm): 17.8mm
Actual outside diameter (mm): 21.4mm
Jac Goudsmit@mavetju I have a story for you about sizes of lumber in the USA 🙂
@JacGoudsmit let me guess, a two-by-four isn’t two nor four….