Is opened and closed spiral penetration hole formed by subsidence of ground or to be folded tube, of the tube is connected is off-center from the arc pattern are each other mechanism to thereby positively retain in the tightness is a junction common use relates to sealing member. Such a sealing member and with tight ends of both sides coupling body, side stage an anti trapezoidal sealing member flange gland devices through the predetermined and fixed by fastening elements assembled into a dresser coupling in, said sealing member pipe is an insertion surface provides plural protrusions. Said straight one side of the card, including R is H is formed a serrated fixing the opposite since a washing tub is rotated in a metallurgical furnaces by elastically by reserving a metering synthetic resin or steel pipe having a non-constant which real estate can be conserved as the airtightness even, after assembly under pressure steel pipe or plastics pipe dresser-fit coupling in which a the water storage tub to the outside is characterised in that it has a can be.