The mounting means B carries a pipe coupling illustrated as a T member 20 receiving {HEAD ~ compressed air} through a line 21 through a solenoid valve 22 from a suitable supply of {TAIL ~ compressed air} designated at 23 
The mounting means B carries a pipe coupling illustrated as a T member 20 receiving { HEAD ~ compressed air } through a line 21 through a solenoid valve 22 from a suitable supply of { TAIL ~ compressed air } designated at 23
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH