Cameron CB599 40 liter tank. Slave. Built 10 January 1989. Light blue cover. CN 3040-1609. According to Camerons Flight Manual, this tank can be used till January 10th, 2014. Inspected recently. PRV and internal + pressure test carried out in 2009. No part replacements or 'serious' inspections needed until the end of the tank's allowed life time.