The Air Valve Control Knob is a practical and versatile solution for controlling air valves in various makes and models. Made of durable aluminum, this plain, script-free knob has a 7/16" inner diameter and stands 1.75" tall. Sold individually, this knob is designed to fit most makes and models, making it a convenient and reliable choice for air valve control. Its simple design and sturdy construction make it a practical and effective solution for managing air valves in a variety of applications.