A removable, replaceable ring at the lower opening of {TAIL ~ the processing chamber} allows process pumping speed to be tailored for {HEAD ~ different processes} by replacing the ring 
A removable , replaceable ring at the lower opening of { TAIL ~ the processing chamber } allows process pumping speed to be tailored for { HEAD ~ different processes } by replacing the ring
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH