Career 707 modified Heavy Duty exhaust valve
Career Heavy Duty longer exhaust valve with a fully enclosed head, this prevents the head from breaking off as is possible with the standard Exhaust Valve. Next picture shows how they can break. Ours is encased in brass and is Much more reliable and less likely to let you down.
See picture of the standard broken valve head.
Always check the power to make sure the gun does not exceed your limit, after changing any parts.