This is a panel mount version of the ST167 and ST168 Chemical injectors. This Injector is made out of Stainless Steel and makes switching from rinse to chemical very easy by simply moving the attached lever. A foam lance without air intake is required to produce foam. The air required to produce foam is provided by an air intake with 9mm hose barb on the injector. This chemical injector can produce excellent foam with the required quantity of compressed air especially with a low-pressure water inlet. The injector is available in nozzle sizes of 1.2 to 2.8 mm and the dosing of the injector can be controlled by one of the ten nozzle inserts that are included. We recommend using blufood food hose with this product. This is a great solution for the industrial cleaning industry.