With a 7/8-inch nozzle and a pressure of 300 psi, the gun fired thickened fuel
up to 280 yards.
was expelled from the barrel by high pressure, creating a thin stream of highly accurate flame.
The heat from the flames burnt, asphyxiated, and blinded personnel while the thickened fuel
rounded corners, burnt combustibles, and forced enemy personnel to close gun apertures.
The M7A1 held thickened fuel
and pressurized air at 3,000 pounds per square inch.
In fact, those who mixed the various components of thickened fuel
were called "mix masters," after the kitchen tool of the same name--hence, the term "hot foot" to the enemy.