{TAIL ~ The nipple} 321 is connected to a source of {HEAD ~ pressurized air}, e.g., to an air compressor, which admits air, gas or steam into the channel 14 
{ TAIL ~ The nipple } 321 is connected to a source of { HEAD ~ pressurized air } , e.g. , to an air compressor , which admits air , gas or steam into the channel 14
TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH