The pot like housing is closed by a cover 4 which has {HEAD ~ an inlet port} 5 for compressed air from {TAIL ~ a compressed air appliance} 
from
The pot like housing is closed by a cover 4 which has { HEAD ~ an inlet port } 5 for compressed air from { TAIL ~ a compressed air appliance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL