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