The six indication grooves. I can't decide on what I want, but everything I've seen and watched they all have 4 groves, never 6.My 3 Impacts have 4 lines on the valve adjuster so max for me is 1.5 turns out from the 4th line. How many lines does yours have?
What part of the picture do you want clarification on?
You don't get too choose when buying one. You get what you got. And it really doesn't matter in setting up the gun.The six indication grooves. I can't decide on what I want, but everything I've seen and watched they all have 4 groves, never 6.