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: Sleeve Outside Diameter (mm): 49 Outside Diameter (in): 1.93 Inside Diameter (mm): 31.8 Inside Diameter (in): 1.25 Sleeve Length (mm): 86 Sleeve Length (in): 3.39