Most PVC over here seems to be in millimeters, but some is not, I think tubing for your aquarium and stuff like that seems to be non-metric some of the time.
Can't separate the 3 barrels from my triad, will therefore glue 3 pieces of PVC and try to come up with some kind of adapter from 3x16 mm (roughly 34mm) to the 20mm(?) or a mega barrel...
Any ideas on the adapter?