Alternatively, the shuttle element may simply be a separating element that does not form a tight seal in the paint line, but only forms {TAIL ~ an unsealed boundary} between the paint and {HEAD ~ the auxiliary medium} 
Alternatively , the shuttle element may simply be a separating element that does not form a tight seal in the paint line , but only forms { TAIL ~ an unsealed boundary } between the paint and { HEAD ~ the auxiliary medium }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD