I narrowed down a CO2 leak to a new gas manifold. one of the valves on it will hiss for a split second when opening or closing it, or if you push the lever at a 90 degree angle to the rotation direction.
pushing on the whole valve cylinder doesnt make any hiss, so it's not leaking in the tape threaded screw in connection to the manifold, or the hose barb attachment.
I also tried tightening the nut on top of the valve handle, but it doesnt seem to push the actual handle or valve in any more. anyone know if the valve can be fixed?