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