Pressure washers & low volume systems need a trigger to give the operator some control of water. These are very handy as the wash gun can manipulate the water pattern from a wide-angle to a pencil spray pattern. Wash down systems in food factories will use these as they are a very simple method to control the water volume.
Food grade triggers are available with stainless bodies. Longest lances are available and can be used with a low/high-pressure pump. These will allow progressive conical spray patterns or long cast full water jet.