Hi All

We have over here, poly risers that come in various lengths from probably 100mm to 750mm, and several diameters 12mm to 50mm. They are black, like the poly pipe used by farmers and the like, but these are less flexible - quite rigid. When you have a poly pipe in the ground, these rigid risers can be attached for taps/sprinklers etc..

Anyway thats just an idea, we've used here for all sorts of things, not just plumbing.

Regards