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