The throttle body is a valve that controls how much the engine inhale. is a circular piece of steel with an axis in the middle, connected to the throttle pull line, and controlled by a throttle pull line. The throttle body is a device on the engine inlet system. Throttle body is generally divided into three parts: actuators, throttle pieces and throttle position sensors, which are generally encapsulated as one. The water pipe on the edge is the exhaust gas reflux to reach a certain emission standard.
Usually the valve body is aluminum, there are a small amount of plastic such as BYD and so on