Milton (S-148) 1/4" NPT Lever Blow Gun - Rubber and Safety Tip Nozzles Rubber tip lever blow gun is both compact and versatile, offering a tight fit and a hang-up hook for easy storage. Rubber tip has a 12.9 standard cubic feet per minute at 100 pounds per square inch. Safety tip has an 11.7 standard cubic feet per minute at 100 pounds per square inch. Has a maximum pressure of 150 PSI and a 1/4" NPT air inlet. Recommended replacement parts: For S-148 blow gun: Milton #P148-4 (1/4 NPT).