Pro-Guard D2 Fuel Filters deliver increased flow and efficiency that are demanded in a Diesel environment. High performance and high flow all in one quality engineered filter. This fuel filter meets or exceed new GM specifications. -Max flow rate is 50 GPH. -Max working pressure is 30 psi. -Water removal efficiency is 99%. This filter has a micron rating of 4 microns, center threads of 3/8"-8 and capable of operating in temperatures between -50 degree F and +225 degree F. This fuel filter is equivalent to GM P/N 12633243, AC Delco P/N TP3012 and Racor P/N PFF50216.