Perry Pumps VP40SG Regulating Pump Gas & Smoke

PERRY REGULATING PUMP The Regulating Pump ensures consistent fuel flow
to 2-stroke engines regardless of altitude, tank position, or fuel level
They improve plug life and fuel economy. Works with any engine that has
good mid-range. Requires tapping of the engine's crankcase.
The SG Pump, designed for gas engines, can be used to pump smoke fuels (such
as diesel) into the engine's exhaust system.
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Regulating pumps are generally used in most 2-stroke engines (but not giant
scale) when one desires a pump.