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