Patent ID: 7073796

Claim:
A metallic packing to be installed between hollow members, comprising: an annular base having an opening through which interiors of the hollow members may be connected to each other; two annular lips that project from an inner or outer circumference of the annular base to an inner or outer side, wherein the annular base has a substantially rectangular cross-section, the rectangular cross section of the annular base has two substantially parallel sides which correspond respectively to an outer circumferential surface of the annular base and the inner circumferential surface of the annular base, the two annular lips are constant in thickness, have a base and a free end, and extend inwardly and transversely with respect to a central axis of the opening from both sides of the inner circumferential surface of the annular base, the two annular lips recede from each other as the two annular lips recede from the annular base, and a distance between free ends of the annular lips is longer than a length of the annular base along a central axis of the opening when the metallic packing is not compressed between the hollow members, the two annular lips are bent elastically at the base, and the distance between the free ends of the annular lips is equal to the length of the annular base along the central axis of the opening when the metallic packing is compressed between the hollow members, and the annular base has two projections provided on the outer circumferential surface thereof, the two projections being disposed symmetrically with respect to the central axis of the opening on the outer circumferential surface.