550/50 D400 3366018/21-N consists of a rectagular jaw frame 3366018-N and blind cover 3366021-N. The set is designed for Nordic conditions, in accordance with standard EN124-2:2015, manufactured from grey cast iron EN-GJL-200 and is classified under Load Class D400.

Cover can be opened using a magnetic lifter CW1600.

Typical application is along the curb stone on a pedestrian way.