Hi all,  I am looking for information (preferably with pictures)
of the spill valve assembly on an Art Echo rotary pump.  We have the
pump, otherwise complete, about to be restored, to power a rare piano
attached to a Hill, Norman & Beard theater organ.  There is evidence
that the spill valve existed, but not enough clues as to what it might
have looked like to be able to replicate the item.  Thanks in
anticipation.

John Weismantel
Sydney, Australia