It is a gas;, 2400 psi. The problem I think is in the wand. Once started it works fine, except the water don't stop coming out of the wand at high pressure. It is like the trigger don't work. Took is apart and found like a stainless still pin that was rusty, cleaned and oiled same problem there is not much in that brass fitting, just the neddle, and it looks like an o ring deep inside and just the white plastic washer. What could the problem be.

Thanks

Brian