This genuine OEM item is designed for use with Jenny pumps that are commonly installed on portable air compressors. It is a special bumper for the wrist pin that is secured in the piston. Unfortunately, over time it will wear out and it may begin to fail eventually requiring a replacement. Keep in mind this high-quality component is made ...Read moreof durable material and is sold as an individual item. Check the diagrams for your model to ensure the correct repair procedure. A wrench set will be needed to replace this bumper-wrist pin.