**Neptune Pump Note: With Motor Option "-FA" or "-FALP", the pump and motor are bought as separate Shopping Cart items but are mounted together when shipped. After adding the pump to the Shopping Cart, go to Product Category = Motors electric to purchase a motor, or contact us for any special motor you require.
NEPTUNE PUMP DRIVE 500-S SIMPLEX: This Neptune diaphragm metering pump drive has a robust motor-driven gear-reduction and hydraulically actuated disc diaphragm. Features one manual stroke length adjust knob on this simplex head. Can be field-converted to a 500-D duplex head. Stroke frequency can be fixed or variable.
