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