Designed to work with a 2.2 - 6 GPM pressure washer. The Model 20 Stainless Steel Compact Foamer is a high pressure chemical foam applicator for quickly applying foaming chemicals to surfaces up close or at a distance. This venturi injection unit draws and accurately dilutes chemical concentrate from the attached bottle and applies the solution as rich, wet foam in a fan pattern or use the zero degree nozzle for foaming at distances up to 25 feet.