1/8 NPT Threading - Fits nearly all regulators on the market today Low Profile. Definitely an awesome option for tanks that change positions. Removes with 5/32 Allen Wrench.
HK Regulator Fill Nipple ONLY
Black fill nipple which is used for both the 3000psi and 4500psi air tanks.Warning! Always make sure to turn off the air calve before releasing the quick...