Banner's addition was "RG-27", a special compound that neutralizes gamma radiation. Since it is most effective in liquid or gas form, a series of tubes were built into the armor for irrigation. This enables the armor not only to withstand radiation, but also allows it to decontaminate areas. To expose a government conspiracy, the two faked a quarrel over some of their designs. Stark unveiled a finished version of the suit to battle the Hulk. When Stark seemed to be acting strangely while wearing the suit, a problem with the irrigation system was discovered, and The Hulk was able to help Stark shut it down before gamma poisoning set in.