| 摘要 |
A fitting having a tapered threaded section, formed by flat-topped threads gradually increasing in height, permits the fitting to be screwed into and permanently retained in an aperture in a wall of a semi-rigid tank. As the threaded section is screwed into the aperture the tank wall distorts increasingly and is then led into an annular relief section, following the threaded section, to captivate the fitting against axial movement. The connector also includes a resilient gasket lying in and encompassing the relief section on the outside of the tank. The gasket is held between, and is compressed by, the tank wall and a flange section of the fitting to provide a fluid-tight seal.
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