Further information for OBO Bettermann 1807 - Expansion piece OBO
. for expansion joints, for connecting the foundation earthing system outside the concrete
. according to VDE 0185-561-2 (IEC 62561-2)
. 2 hexagon nuts M10 x 30, 2 washers made of steel, hot-dip galvanized and 2 serrated washers made of stainless steel