Cat fuel injector nozzles utilize specialized product metallurgy, proprietary manufacturing processes and design, to deliver injectors capable of meeting today's performance and injection pressures for emissions requirements. Overall Length (mm): 94.5 Overall Length (in): 3.72 Head Outside Diameter (mm): 190.0 Head Outside Diameter (in): 7.48 Pilot Outside Diameter (mm): 131.0 Pilot Outside Diameter (in): 5.16 Inside Diameter (mm): 33.0 Inside Diameter (in): 1.30