The Viper Foam Gun is light weight and easy to use. Just fill the container with solution, dial in the desired dilution ratio and start injecting foam into the coil body. The foam injection method will cover the surface of the coil much faster and increases contact time over conventional pressure sprayers. The Viper Foam Gun is designed for both Viper Heavy Duty and Viper Brite. The Viper Foam Gun will penetrate soils up to about 80mm deep but with the foam funnel attached, foam can be injected up to 300mm deep.