Application: used at bulkheads with water tight requirements, light type widely used above freeboard deck, heavy type with certain water pressure can be used below freeboard deck where the water tight requirements is strict Optional: port light/ single handle operate/ hand wheel operate Material: steel/ stainless steel/aluminum Max. Pressure: 0.45Mpa Available certificates: LR-BV-DNV-GL-ABS-NK-KR-RMRS-CCS