so what the gain of using a power valve on esr there pv cylinders are like 1200 bucks extra.
ProX 409cc Cylinder Kit
: ProX 409cc Cylinder Kit - $1,799.00 Prox 409cc Power Valve Cylinder Kit : Prox 409cc Power Valve Cylinder Kit - $2,399.00
what the diferance other than the fact that one has a power valve and the other doesnt?