You can run the barrel valve with nitro, gas or alcohol. RBS can set up for your specific application at no extra charge. Barrel valves can be ordered with or without idle/pump saver checks.
Picture below is barrel valve with idle check and pump saver check but they are sold separately.
Please specify nitro, gas or alch. and roots or screw blower when ordering. The racer also gets there choice of -8 or -10 inlet and outlet fittings.