In {TAIL ~ a fourth aspect} of the present invention, in addition to the first aspect, {HEAD ~ the gate} is connected to a portion of the groove, i.e., the portion not forming a sealing surface of the seal 
In
In { TAIL ~ a fourth aspect } of the present invention , in addition to the first aspect , { HEAD ~ the gate } is connected to a portion of the groove , i.e. , the portion not forming a sealing surface of the seal
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH