| 摘要 |
A through-fitting for a box or bulk head contains a cavity which holds grease. When the through-fitting is tightened, grease from the cavity is automatically injected to seal the through-fitting. The through-fitting may be used in below-grade junction boxes. A junction box has various useful features. The junction box can be conveniently injection-molded. The junction box has application in fields including wired telephone connections.
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