This sort of piping is banned in the USA because of catastrophic failures.
http://www.polybutylene.com/poly.html

No, that's polybutylene. That is a totally different plastic, normally
terminated with crimp fittings. It is completely different from what we use,
which is polyethylene with pushfit or compression jointing. They call our
polyethylene/MDPE pipe PEX over there. It is widely used, but not as widely
as over here. They still use the crimp fittings, though.

Christian.