Will ship first class mail envelope no tracking....The Graco Manifold O-ring 104361 is a replacement part specifically designed for Graco products, ensuring a perfect fit and optimal performance. This O-ring plays a crucial role in maintaining a tight seal within the manifold, preventing leaks and ensuring the smooth operation of the equipment. It is a genuine Graco part, known for its quality and reliability in the realm of painting supplies and home improvement projects.