Cheap and easy to make hop back.

[SHIELDS EXILE]

After trying all sorts of biabs homemade and bought, I cut habit of75mm water pipe,PVC, and cut a dozen hacksaw slots halfway through it, and wedged it in my mash run across the bottom inside between the back of the outlet tap and the opposite wall of the vessel,an old 23l fementer'it works better than any biab, and is easy to clean.