Shop › Solenoid Operated Chemical Pump Image 1 of 1 Solenoid Operated Chemical Pump $600.00 2 gallons per hour. Multi-voltage 110V AND 220V4-20mA control for external adjustment with a PLC. Quantity: Add To Cart Added! 2 gallons per hour. Multi-voltage 110V AND 220V4-20mA control for external adjustment with a PLC.