A new security device to prevent the theft of anhydrous ammonia from farms and fertilizer depots has just been unveiled. Called the NH3 Amo-Lock, it fits on a storage tank's withdrawal valve and provides a simple, fail-safe method of securing the contents in a field, at a fertilizer dealer or en-route. Once installed, the NH3 Amo-Lock becomes integral with the valve and is easy to operate one-handed, even when wearing gloves. The operating key (valve handwheel) can only be removed when the valve is fully closed - a safe condition. In addition, because operation does not involve climbing up onto the tank to fit a cover or padlock, there is no risk of injury.