EK 2020-D II USArticle No. 504795 EK 2020-D-II-US 2 Spare Parts available Channel switch with rupperPCB Choose Spare Part Spare Parts Channel switch with rupper020 Channel switch with rupper Complexity Article No. 523808 Choose Spare Part PCB090 PCB Sym. Imp.transducer Complexity Article No. 545205 Choose Spare Part Attention! Due to the complexity of the repair, some of the spare parts shown can only be replaced by specialist workshops. In this case, please contact your nearest Sennheiser Service Center.