imp air leak?

[2scoops]

i run a impulse off a pmi 4500psi air system and i have a custom products on/off.if i gas the gun up and then turn off the on/off and leave marker with air in it, is it normal for the air pressure to drop from 160 to 100psi over about an hour or have i a small air leak , will the solinoid leak some air anyway over a period of time

 

[Rabies]

It indicates a slight leak, but if it takes an hour to drop from 160 to 100psi then it's not worth worrying about. Most likely it's the valve not quite sealing perfectly, but the rate of the leak is so small it won't have any effect on the marker's performance.