Micro Switch ( V7-6B19D8 ) Service kit 60320-03, used on Fleck Valves ( 5000, 5600, 7000 ) as an option item for control of external electric devices. Used to "lock out" other filtration equipment or send "signal" when Valve is in Regeneration ( Backwash ) process.
Includes ( 2 ) Mounting screws.
And the switch is marked.. you use "common" ( bottom connection )
either NC ( normally closed circuit )
or NO ( normally open circuit ) connection depending if you are allowing current to flow or not when in stand by.