Specification: 1. D series marine weather tight single-leaf steel door. 2. Produced as drawing. 3. CCS, BV, ABS, BL, KR, LR, DNV, NK, RINA, RS. 4. Marine use steel. Used for the doorway of superstructure above freeboard deck or deck house to meet ISO 6042-1980. It can be fitted with special robber lock device. DF type is square corner, DY type is round corner. Test Requirements: Class D- the door must pass the hose test from the top to the bottom, without the water pressure requirements. Door Class & Application Position: Class D- Front bulkhead of the fourth superstructure above freeboard deck and the after bulkhead & side wall of the third superstructure.