DIESEL. Regulator gasket. A component which provides a sealing surface at the Exhaust Pressure Regulator. Mounting gasket for Fuel Injection Throttle Body. O-Ring. EGR modulator o - ring. Exhaust Back Pressure Regulator Gasket. Fuel Injection Throttle Body Mounting Gasket. Regulator seal. Included with: EGR modulator, Regulator.