Patent ID: 7441810

Claim:
A coupling device, for engaging with a waste pipe, comprising: a main body having an exterior surface and a first end and an opposed second end, for insertion into an opening of the waste pipe; only a single movable member being freely slidable axially along the exterior surface of the main body between the first and the second end of the main body; only a single sealing sleeve supported by the main body, a second end of the sealing sleeve being directly affixed to the main body adjacent the second end thereof while a first end of the sealing sleeve being directly connected to the movable member, and the movable member being located between the first end of the main body and the sealing sleeve; wherein the sealing sleeve, in a normal unbiased state, has an intermediate section with a transverse dimension which is greater than a transverse dimension of both the first and second ends of the sealing sleeve; whereby when the movable member is moved along the main body in a first direction toward the first end of the main body, minimum dimension of the sealing sleeve is achieved to facilitate insertion of the second end of the main body into the waste pipe and, when the movable member is moved in an opposite second direction along the main body toward the second end of the main body, a maximum dimension of the sealing sleeve is achieved to facilitate formation of a seal with an inner surface of the waste pipe.