Safety blow gun with super volume comes with an OSHA compliant safety nozzle so air flow will drop below 30 psi when dead ended. With a 1/4 in. NPT and nozzle thread size of 1/2 in. -27, this super volume safety blow gun is made of Zinc Alloy. With a maximum working pressure of 150 psi, this blow gun offers 23.6 SCFM at 100 psi.