Product Details: The Hendrickson Tiremaax Pro Hubcap Window Kit is a replacement kit for the windows on Hendrickson Tiremaax hubcaps. The kit includes a new window, cover plate, gasket, and O-ring. The window is made of high-quality acrylic and is designed to provide a clear view of the tire pressure. The cover plate is made of durable plastic and helps to protect the window from damage. The gasket helps to seal the window and prevent air leaks. The O-ring helps to create a watertight seal. FleetPride is your First Click in Heavy Duty®.