Cock and ball: Turn off the prop is a plunger or a ball, rotating around its own axis.
旋塞和球形：关闭件是柱塞或球，围绕本身的中心线旋转。
2
The target point helps to direct the movement of the shooting arm and accelerate the straighten of the shooting arm, thus fully complete the flicking of the ball during the process of cock wrist.
We suggest the use of a model DET expansion tank, the Watts Governor 80 ballcock with integral thermal expansion relief valve, or a 530C calibrated pressure relief valve.