S
SandyMac
I've done alot of on-farm plumbing with blue 20mm and 25mm water pipe and plasson fittings. I need to join some blue to some old black poly. I think I'm right in saying that blue is measured externally, but the older imperial black is measured internally, in which case it is 3/4". Can I use a 25mm plasson compression fitting on the black, or will I need to get a metric to imperial connector? I think the Philmac ones do both??, but I can't seem to get on so well with them. Any advice gratefully received.