Auxiliary Switch Kit part # V3009 for Clack timer WS1 for Clack WS1 and WS1.25 Valve and other "brands" that use the Clack type of valve under their private label.
This is sometimes called a "Lock Out" switch.
Slip the washer and retaining ring on to the end of the piston rod.
Attach the microswitch to the drive bracket using the screws.
Attach the connector to the microswitch.
Attach the terminals to wires and connect.
Wire can be feed through the backplate near the power cord slot ( break out power cord spacer to create a slot opening ).
NOTE: No wiring included with this kit.
And the connectors included are for your convenience, but may or may not be the best for your application / wire size.