Check the listing for details. Aqualung BCD XS SM Black Aqua Lung Pre-owned. Condition: Used. Listed at 99.48 USD. The Aqua Lung BCD XS SM in Black is a pre-owned medium-sized Zuma model from Aqua Lung. This unit quantity of 1 is a reliable and well-known brand in the scuba diving industry, known for its quality and durability. Perfect for scuba enthusiasts looking for a medium-sized BCD with the trusted Aqua Lung brand name and sleek black design.