The Viper Foam Gun is the easiest and most cost-effective way to clean radiators, plate heat exchangers, mechanical equipment and hardware, coils and other HVACR equipment. The foam injection method covers the surface of the coil much faster and increases contact time over conventional pressure sprayers. There’s no heavy equipment to carry and no need to pre-dilute, just plug the Viper Foam Gun into any garden hose connection, dial in the dilution ratio, aim and activate the trigger.