The plate has a viewing hole juxtaposed in visual alignment with {HEAD ~ the burner} for {TAIL ~ visual confirmation} of flame ignition 
for
The plate has a viewing hole juxtaposed in visual alignment with { HEAD ~ the burner } for { TAIL ~ visual confirmation } of flame ignition
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH