Designed for extra high pressure application with low flow.See attached brochure for details. Protek 366 38mm Ajustable Flow Pistol Grip Nozzle Protek 361 25mm Ajustable Flow Pistol Grip Nozzle Protek 333 Multipurpose Nozzle Protek 332 Multipurpose Nozzle Protek 307 Forest Fire Nozzle