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