| 摘要 |
<p>A ferrule is used together with other components to couple a liquid tight fitting to flexible metal conduit. To assure secure coupling, the ferrule must be fully engaged with the flexible metal conduit. Full engagement of the ferrule is not always obtained because of carelessness, burrs, tightness or other obstructions. Even if full engagement is achieved, it is not always maintained as other parts of the fitting are assembled. The improved ferrule includes a hole which provides means for visually inspecting the engagement of the ferrule with the flexible metal conduit even after the fitting is fully assembled. The ferrule may or may not include an outer cylindrical wall for enclosing a portion of the end of the flexible metal conduit.</p> |
