{TAIL ~ The vent hole} is preferably closed between {HEAD ~ the tapping} of the intermediate pressure portion and the discharge pressure portion 
{ TAIL ~ The vent hole } is preferably closed between { HEAD ~ the tapping } of the intermediate pressure portion and the discharge pressure portion
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH