Ref Part # 8181986, 181986

NON-Spring Slave Valve 

This valve is used to control the Bead Loosener Arm and on older model machines (ie 5060 AX/ EX, 7060 AX/EX) the Table Top Clamping (Open/Close). 

Best way to determine if your machine requires a slave valve is to visually search for the silver FLAT plate box on the back of the valve. 

Fits - 50/60/70/80/90 X-Model Series