The perfect companion to the PPE Fuel Rail Plug is this Viton O-Ring. It is made from high quality, chemical resistant Viton rubber. This ring is better than the stock o-ring and will last longer, too!
The PPE Fuel Rail Plug (heat treated SS construction) replaces stock or a shimmed pressure relief valve. This valve helps maintain fuel rail pressure during full throttle driving by completely blocking the pressure relief port (effectively deadheading the fuel rail).