{HEAD ~ The poppet valve assembly} 1 wherein {TAIL ~ said housing} has cutouts for viewing said sight glass 
{ HEAD ~ The poppet valve assembly } 1 wherein { TAIL ~ said housing } has cutouts for viewing said sight glass
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH