MODEL 326 GII FAS {STANDARD CAMLOC, WITH FOAM}DART's Simplex Aerospace Model 326 GII Fire Attack aerial firefighting system is the 2nd generation firefighting tank for the AgustaWestland AW139 helicopter. The GII system consists of a belly mounted tank and a DC hover refill pump and hose. The belly tank is manufactured from high strength, low weight carbon fiberglass material and holds 1,893 liters (500 gallons) of water.