Milton® (S-440-4) 4 1/8" Heavy-Duty Straight Truck Valve Stem Extension Milton® 4 1/8" truck valve extensions allows you to easily reach and quickly check or inflate/deflate your tires. Built with external threads provides the inflator a more secure hold. These truck valve extensions are perfect for use with trucks or buses to extend existing tire valve. Product Specification: - Made of nickel plated brass - 1†long skirt - High heat resistant cap - Thread size: .305-32 standard bore valve - 4 1/8†long valve extension