Elevate your truck interior with the Aluminum Screw On Air Valve Knob with Glossy Emergency Script Sticker. Designed as a semi-truck emergency air brake valve control knob, this aftermarket replacement part is made from aluminum and features a screw-on design with an Emergency script sticker. It is available with black, blue, or red sticker options. The air valve knob is sold individually and is listed for universal heavy-duty truck applications. A warranty covers defects in workmanship and material from the date of purchase. This interior truck accessory is an aftermarket replacement part rather than an OEM component. The item is special order, cannot be canceled, and is non-returnable, so be sure to verify your application and compare the knob with your existing part before installation.