Pex

[mark]

Never considered PEX.

When I think PEX, I think household plumbing to my tap-sets and toilet, not running 1" return line or 2" drain.

There is flexible PVC (one name/brand is Spaflex) and uses standard PVC fittings.

[Treebeard]

Spaflex looks like it might be a good idea too, and I think it is available in the local hardware store here.