158 With a 2' angled extension, this safety blow gun is great for hard to reach areas. Has an air inlet of 1/4" NPT and a Maximum working pressure of 150 PSI. Includes both a safety nozzle and a rubber tip. This safety blow gun is compliant with the safety nozzle only, which will limit pressure to 30 PSI when dead ended. Nozzle thread measure 7/16" -27. 1/4" national pipe thread air inlet Maximum working pressure of 150 pounds per square inch Safety nozzle offers 10.5 standard cubic feet per minute at 100 pounds per square inch Rubber tip offers 11.6 standard cubic feet per minute at 100 pounds per square inch