This is a Haltec A-148 Large Bore Screw Driver Valve Cap. This large bore valve cap fits .482-26 valve threads. The scredriver cap allows for easy removal of the valve core in the shop or out in the field. Haltec Corporation has been the leader in the tire valve industry for over 45 years. When underground mines were transitioning from rail wheels to rubber tires, Haltec was there to design and manufacture the tire valve systems required to meet their technical needs. Haltec maintains its leadership position as a major manufacturer of specialized tire valve systems. Many new product innovations were introduced by Haltec, including the Full-Flo and Super Large Bore valve designs. These designs provided the tire industry the unique products required to achieve faster flow rates, decreased downtime, and more efficient tire management.