A valve box 6 constitutes {HEAD ~ means} for connecting {TAIL ~ the pump chamber} 5 to a suction pipe via at least one check valve that allows fluid to pass in direction A 
for connecting
A valve box 6 constitutes { HEAD ~ means } for connecting { TAIL ~ the pump chamber } 5 to a suction pipe via at least one check valve that allows fluid to pass in direction A
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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