Fuel Regulator Kit includes, Dual Adjustable Regulator, compatible with Race Gas, E85 or Alcohol/ Ethanol and two AN-10 tapered flare fittings. Fittings utilize O-ring seal to ensure easy and secure fitting. Regulator can connect directly to fuel log for Carburetor by-pass. Main Pressure (High Pressure) adjuster is on top and Idle Pressure Adjuster (Low Pressure) is on side. Fuel inlet on side of housing and fuel return is on bottom. Vacuum port vents to atmosphere and should not be capped.