Surface boxes of cast iron similar DIN / TYP

If the surface boxes are not treated, the dirt will solidify and it will only be possible to open the cover with great effort.
The surface boxes with a wedge-shaped cover seat provides a remedy here!
The dirt cannot tilt the lid, as the lid edge narrows downwards. In addition, the cushioning insert ensures a secure hold. The surface box is always easy to open, even under adverse conditions.