German translation: einseitiges Anschlussstück / doppelseitiges Anschlussstück
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Explanation: Since we are talking about antenna installation I believe we are dealing with the (water-tight) fittings used to run cables in and out of units. one-sided fitting would be Abschlussmuffe, and two-sided fitting simply is Muffe.
Even if it is about connecting pipes those thingis are still called Muffe.