The sealing ring 180 is to seal {TAIL ~ the decorative trim ring} 120 so that moisture and {HEAD ~ air} does not enter the bulb area once the bulb is installed 
The sealing ring 180 is to seal { TAIL ~ the decorative trim ring } 120 so that moisture and { HEAD ~ air } does not enter the bulb area once the bulb is installed
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH