The shuttle element may be in the form of a so called slug go devil or pipe cleaner swab that forms a relatively tight seal between the paint on one side and the auxiliary medium on the other side, and that {HEAD ~ scrapes} or swabs along {TAIL ~ the walls} of the paint line as it moves along therein so as to clean the paint line 
The shuttle element may be in the form of a so called slug go devil or pipe cleaner swab that forms a relatively tight seal between the paint on one side and the auxiliary medium on the other side , and that { HEAD ~ scrapes } or swabs along { TAIL ~ the walls } of the paint line as it moves along therein so as to clean the paint line
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