Attributes . Unbreakable, watertight, airtight, dustproof, chemical resistant and corrosion proof; Buoyancy allows case to float in salt water with 3.6 KG (7.94 LB) load; Includes an automatic purge valve for quick equalization after changes in atmospheric pressure; Features an exclusive 6.4 MM (0.25 IN) neoprene O-ring and ABS latches for excellent seal . Names