Water-pressure-tight wall bushing for white tanks, for leading the earthing conductor/equipotential bonding conductor through concrete, with adjustable M10 threaded rod. Type for formwork installation with water barrier and M10 / M12 double thread. Including terminal clamp (St/tZn, 30 x 4 mm) with square hole for connecting round conductors by means of a clamping piece or flat conductors by means of a cross unit.