There is a plastic pipe sold in the US specifically for compressed air use.
It is _not_ PVC pipe, which is dangerous and illegal to use for compressed
air. This stuff is usually colored green and is made from ABS. Chem-Aire is
one brand name. It is much more expensive than PVC pipe. It is not
compatible with some synthetic compressor oils. I don't know if this pipe
is available in England.

A forklift driver at work broke one of these green plastic air lines a while
back. It did not throw shrapnel like a PVC pipe would have.


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Steve