| 摘要 |
<p>A clean out device includes a frame which is welded into a pipe conduit clean out elbow or the like and has a cover and clamping assembly which pulls the cover up into sealing engagement with the frame. When the clamping assembly is actuated in the opposite rotational direction, it forces the cover away from the frame thus breaking the cover loose from any corrosion or the like which may have occurred around the junction between the cover and the frame. It also forces the cover open against any material which may have become caked or jammed around the seal.</p> |
