The purpose of this tool is to provide extra cleaning power and is achieved through a simple, reliable pinch valve, where a roller presses down on a rubber hose to close off the air flow. When fully open the air flow is not restricted by typical valve ports, resulting in a higher performance, with a fine control for cleaning carburetor jets etc. Made from 304 stainless steel and a 1/4" ss tube nozzle with 4.6mm bore. The rubber hose is now toughened with a recommended operating range of 50 to 250 psi. Designed for general industrial use. This product has a one year warranty.