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