Make it easier to inflate your truck s tires with the Milton 3-1/16 Truck Valve Extension. This item makes it easier to fill tires that may be difficult to reach such as the inner tires of big rigs. Simply insert the extension into the valve and the air hose onto the extension. Milton air valve extensions are small and lightweight easily fitting into a truck s glove compartment or an emergency kit allowing you to fill flat tires while in transport.