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