Delivery from the pump likewise comprises {HEAD ~ a valve box} 7 with {TAIL ~ a check valve} including a tail 8 and likewise passing fluid in direction A 
Delivery from the pump likewise comprises { HEAD ~ a valve box } 7 with { TAIL ~ a check valve } including a tail 8 and likewise passing fluid in direction A
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH