The MLD Race Plug/ Fuel Valve Delete is a genuine heat treated stainless steel plug that replaces the stock pressure relief valve. 
 
This valve helps you maintain fuel rail pressure during high engine load conditions by eliminating the pressure relief valve that returns fuel back to the fuel tank. It eliminates potential low fuel rail pressure DTC codes P1093 or P0087 (low fuel rail pressure during power enrichment) that are caused by insufficient Pressure Relief Valve spring pressure.
This plug will fit right into the factory location.
Fits: 
2001-2004 Chevy GMC 6.6L Duramax LB7
RACE USE ONLY!!!!