The pump base contains an integral, pilot-operated, 3-way air valve which controls vacuum on/off via a solenoid valve. When the solenoid valve is energized, the vacuum pump turns on. When the solenoid valve is de-energized, the pump turns off.

-2S24D: 24V DC, 2.3 W Solenoid Control Valve (-2OS24D for normally open supply)
-2S110A: 20V AC 60 Hz (110V AC 50 Hz), 2.3 W Solenoid Control Valve (-2OS110A for normally open supply)

Order DIN T-9 Molded Cables Separately:
923-2M01: Standard 2M
923-2M31: L.E.D. 0-50V, 2M
923-2M81: L.E.D. 70-250V, 2M