| 摘要 |
The present invention is a sewage clean-out line cover and removable cap made of Ultra High Molecular Weight Polyethylene. The interior of the cover carries a plurality of rows of upwardly inclined teeth, the rows being parallel and unconnectable to each other. The teeth comprising each row have a pitch to depth ratio of approximately 1:1. The ratio of the slope of the upper surface of the teeth to the lower surface is 1:1, thus providing a tip for installation over the open end of the upstanding clean-out pipe which tip is flexible for pushing the cover over the open end of the clean-out pipe due to the inherent lubricity of the UHMWPE but which resists removal of the cover by the tips folding over to increase friction against the clean-out pipe outer surface. The cover is usable with cast iron or PVC pipe or any other presently known material used to form sewage clean out pipes. A second embodiment of the present invention includes a magnet inserted in the upper surface of the cover and selectively may include an additional magnet into the upper surface of the removable cap.
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