Patent ID: 8025079

Claim:
A check valve for preventing liquid from entering a pipe system comprising: a housing operable to be positioned in a pipe, the housing formed of a rigid material selected from the group consisting of metals, alloys and plastics, and the housing also including an exterior surface, open ends, and an inner surface, the exterior surface being dimensioned to engage an interior surface of a pipe, and the inner surface being cylindrical and having a tapered portion proximate at least one end; a removable plug positioned at least partially within said housing, said plug having a top surface, a bottom surface, a handle and a side wall, the handle consisting of a graspable member positioned on the top surface and the side wall consisting of a lower section proximate the bottom surface having a first diameter, an upper section proximate the top surface having a second diameter greater than the first diameter and a sloping portion extending between the upper section and the lower section, the sloping portion of the plug engaging the tapered portion of the housing, and the lower section of the plug engaging the inner surface of the housing, to frictionally secure the plug in the housing and forming a seal between the housing and plug.