How to ident High and Low Pressure Pistons

[Severe]

I've got 10 new pistons in; 5 High pressure and 5 Low. Thing is, I have no clue how to distinguish the two apart.

Is there some way to identify which is which by simply looking at them?

Thanks in advance!

[nate2k191]

not sure which pistons you mean, the kind inside the valve?

[Severe]

That's correct. The piston that goes in the regulator of the valve.

[SocialD]

It has been a while, but I think that the set screw will be screwed in farther on the HP pistons.

[Severe]

Thanks much SocialD. At first inspection, they looked identical but you are correct. There is a slight difference in the set screw.