Special caps for the SE, E 30x15 and 40x20 installation conduits. The Conduit Profile does not have to be modified to fasten the caps: the caps are fastened using Self-Tapping Screws which are screwed directly into the screw channels in the profiles. This simultaneously secures the lid from lifting off and acts as an electrically conductive connection between the Conduit Profile and the lid. Recommended screws for fastening the Conduit Caps: Modular 30 mm dimension: Self-Tapping Screw DIN 7981 3.5x6.5 (Order No. 8.0.008.65) Modular 40 mm dimension: Self-Tapping Screw DIN 7981 4.2x9.5 (Order No. 0.0.196.98)