Surface boxes cast iron In order to detect the correct road cap faster and which class it is, the classes are marked with colors TYP similar DIN according to DIN Variants: Cast iron, DIN DVGW - height adjustable and rigid proven Cast iron, TYP similar DIN optimized Cast iron, TYP similar DIN, TELSTRA XL more border, more hold DIN – DVGW rigid DIN – DVGW height adjustable TYP TYP-TELSTRA XL Support plates DVGW certification