This is an authentic part which is supplied by the original manufacturer for use with Generac portable generators. It is utilized to secure and provide a tight fit for the fuel tank valve. This is a high-quality replacement for a damaged or a missing hardware that was installed on a new unit. To ensure the correct location and application of this part, refer to the appropriate diagrams of your model. It is made of durable rubber and is sold individually. You may need pliers to remove and secure the bushing.