A front end portion of the attaching port 41 is formed with {HEAD ~ a rib} 42 in {TAIL ~ a ring like shape} to enhance an effect of preventing the pipe to be connected from being drawn 
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A front end portion of the attaching port 41 is formed with { HEAD ~ a rib } 42 in { TAIL ~ a ring like shape } to enhance an effect of preventing the pipe to be connected from being drawn
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH