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