A trough 28 has a pair of rectangular holes 29 formed through opposed sides thereof, for captively receiving flanges 27 therethrough, preventing rotation of {HEAD ~ cylindrical valve member 24b} with {TAIL ~ respect} to trough 28 
with
A trough 28 has a pair of rectangular holes 29 formed through opposed sides thereof , for captively receiving flanges 27 therethrough , preventing rotation of { HEAD ~ cylindrical valve member 24b } with { TAIL ~ respect } to trough 28
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH