315-series Optimized 3366131-N is floating type, round frame for lockable, round blind cover 3366132-N or grating 3366133-N. The frame is designed for Nordic conditions, in accordance with standard EN 124-2:2015, manufactured from ductile iron EN-GJS-500/7 and is classified under Load Class D400.

The frame assembly is compatible with DN315 mm telescope pipe.

Typical applications are inner streets, car parks, pedestrian zones.