General description Connect Common Rail Copper Injector Washer is designed for use in diesel engines, specifically for common rail systems. Each washer measures 20mm in outer diameter, 9.4mm in inner diameter, and 0.9mm in thickness. This product is available in a pack of 50 pieces. Technical specifications Outer Diameter: 20mm Inner Diameter: 9.4mm Thickness: 0.9mm Quantity: 50 pieces