It is a genuine item that is supplied directly from the original equipment manufacturer for use with Rolair compressors. The safety valve is designed to keep the tank from over-pressurizing, unfortunately, over time it may wear out or get damaged eventually requiring a replacement. Keep in mind this high-quality part is made of durable me...Read moretal and is sold individually. Please make sure to refer to the appropriate diagrams of your model for the correct location and application of this component.