Suitable to empty ballast tanks, bilge wells, etc. in emergency cases. Often used for draining cargo holds during and after the washing procedure. Especially preferred where an electric spark may risk ignition or explosion. Required air pressure is 0.59 MPa (6 kgf/cm2).

适用于紧急情况下的空压载舱、污水井等。通常用于在清洗过程中和清洗后排空货舱。尤其是在电火花可能会着火或爆炸的地方。所需气压为0.59 MPa（6 kgf/cm2）。