a cylindrical portion having a hollow cylindrical shape and protruding in {TAIL ~ the sliding direction} from the surrounding portion of the lid portion for receiving and covering the upstream end of {HEAD ~ the first cylindrical portion}, the cylindrical portion having a protruding end in the sliding direction, and 
a cylindrical portion having a hollow cylindrical shape and protruding in { TAIL ~ the sliding direction } from the surrounding portion of the lid portion for receiving and covering the upstream end of { HEAD ~ the first cylindrical portion } , the cylindrical portion having a protruding end in the sliding direction , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH 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