wrote in message
ps.com...


Hang on a minute, this is uk.d-i-y! Surely the discussion should be
about what might happen to the lower ball valve which the op is
attempting to submerge in a couple of foot of water. Surely aren't
designed to do? Would it survive?



They would survive OK. My mate's farm has all his water troughs fitted with
two. The lower one is normal, and the upper is fed with water from a holding
tank supplied from waste warm water from a heat exchanger that's used to
partially cool milk.
(that was what helped with my initial idea)

Julian.