Milton S-153 Lever Style Rubber Tip Straight Blow Gun, 1/4" NPTMilton Rubber Tip Straight Blow Guns are perfect to use where leak proof connection is required when blowing out fluid lines. A must where metal tip could mar delicate finish in molds or painted surfaces. Also offers a tight fit. 1 4" NPT Lever Style Blow Gun Kit Maximum working pressure of 150 pounds per square inch 1 4" national pipe thread air inlet 11. 4 standard cubic feet per minute at 100 pounds per square inch Perfect to use where leak proof