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