As a light connection box with membranes, the Primo membrane box M1 35 allows tool-free cable and pipe entry for M20, M25 and M32. The membrane encloses the pipe absolutely concrete-tight. The integrated pipe grip holds the pipe securely and strain-free in the right place. The special octagonal shape means 70% more clamping space is available during installation. The lid of the box has been provided with a honeycomb profile on the inside. The advantage: dowels do not hang in the empty space, but are held stable. The narrow 35mm lid opening is suitable for lights with narrow lamp bases. The optionally available wings are suitable for a concrete cover of 20 - 60mm. A suitable clip-on frame extends the box by 2.5 cm each for even more clamping space.