Then {HEAD ~ the entire paint line} is flushed out using {TAIL ~ a flushing medium}, before supplying the second paint through the paint line 
is flushed out using
Then { HEAD ~ the entire paint line } is flushed out using { TAIL ~ a flushing medium } , before supplying the second paint through the paint line
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH