1.Air valve 2.Meterial:rubber and metal 3.Stright and curve air valveTR1 TR4 TR6 TR13 About us:Our company mainly products are in the all serials of Wheel Barrow, Hand Trolley, Platform Hand Truck, Rubber Wheels, Tires and Tubes, we can do:1.Different model and size as your need2.Original Equipment Manufacturer3.We can produce goods modeled as your samples