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