They feature an internal valve ball that reduces fuel spillage from carburetor vent tubes in crash situations and reduces fuel slosh from vent tubes during hard launches/stops or while traversing rough terrain in off-road racing or rough-water marine racing. When the valve is in an upright position, fuel vapors vent normally through the carburetor vent tubes. Holley has two versions available, one with a barbed end and one without, to cover most racing situations. The Lucas Oil Off-Road Racing Series and Traxxas TORC off-road series currently mandate the use of spill reduction valves in their series.

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