This is Perry"s Regulating Pump, which is Used to Ensure Consistent Fuel Flow to 2-cycle Engines. This is used with Glow Fuel Only! FEATURES: This pump will provide fuel flow in any attitude, tank position, or fuel level. Helps improve plug life and fuel economy. Works with any engine with a good mid-range of RPM. Requires tapping of the engines crankcase and installation of the pressure fitting. INCLUDES: One Perry Pump Regulator One 6-32" Crankcase Pressure Fitting. 4" of Semi-flexible Fuel Tubing Mounting Strap Instructions. SPECS: Measures 35mm long x 25.5mm in diameter. REQUIRES: One #36 Drill Bit and a 6-32" Tap COMMENTS: This pump should NOT be used on an engine that is equipped with an air-bleed type of carb (For Example: some O.S. and Fox Engines). If you have an air-bleed type carb Perry MAY make a pump carb for your engine that would work with this pump. This pump may be used, without modification, with an engine equipped with a low-speed needle valve (like Super Tigre engines). Pump Has Three Fuel Fittings: One Tank To Pump Inlet One Crankcase To Pump Pressure Inlet One Pump To Carb Outlet 10-22-98kzh ir/jl