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. Mount Type: Cup Mount Overall Length (mm): 114.3 Overall Length (in): 4.50 Cup Outside Diameter (mm): 152.4 Cup Outside Diameter (in): 6.00 Cup Inside Diameter (mm): 78.9 Cup Inside Diameter (in): 3.11