{HEAD ~ The first valve} is provided in the first connection passage to open and close {TAIL ~ the first connection passage} 
{ HEAD ~ The first valve } is provided in the first connection passage to open and close { TAIL ~ the first connection passage }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL