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