Flow Engine Aluminum Oil Injector Fuel Rail Kit for B-Series engines including B16, B18, B20, Si, LS, GSR, and Integra.Compatible with Civic, Del Sol, and Integra models equipped with B16A, B16A1, B16A2, B16A3, B18C, B18C1, B18C5, B20B, and B20Z engines.The fuel rail features an aluminum construction and includes mounting provisions for an OE-style or adjustable fuel pressure regulator without modification.A 1/8 NPT port is provided for nitrous system integration or fuel pressure gauge installation.The fuel bore measures 1/2 inch.Includes all hardware shown in the product image.No installation instructions are included.Allow for a measurement variance of up to 1 inch due to manual measurement.Color may vary slightly from displayed images due to screen differences.