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DUPLEX II Series Pumps

Duplex II Pumps are designed for a wide range of applications and are constructed from a selection of materials suitable for handling a broad range of chemicals. The Duplex II series of diaphragm pumps are self-priming and can be run dry without harm. They are intended for intermittent duty cycles but can be run continuously for short periods of time. The higher the duty cycle the shorter the expected life of the pump.

Everything from the back flow preventer, check valves, bearings and diaphragm assembly to the motor, have been designed to make this truly the most advanced and reliable diaphragm pump available. Higher efficiency of the pump is evident in the longer life of the motor pump unit. The new diaphragm design combined with the new valves makes the pump capable of pulling higher dry vacuum. Duplex II is available in various performance ranges, voltages and with a choice of elastomers, making it easily adaptable to a diverse range of applications.

Typical pump uses are liquid transfer, spraying, cooling, circulation, filtration and dispensing.


Self priming up to 8 feet (2.4 m)
Can run dry without damage and handle liquids up to 140° F (60° C)
Chemical resistant material
Internal bypass standard
Built-in back flow preventer
Heavy duty ball bearing drive system


Pump: Positive Displacement two piston design
Flow Rate: 1.6 GPM (6.00 L/min) - 2.2 GPM (8.32 L/min) Nominal
Pressures: Up to 100 PSI (6.89 bar)
Motor: Permanent Magnet with solid state rectifier
Voltages: 12 & 24 V DC, 115 & 230 V AC
Cycle: 50/60 hertz for AC models
Dry Vacuum: Up to 8 feet (2.4 M)
Pressure Switch: Adjustable From 15 to 100 PSI
Maximum Operating Pressure: 100 PSI (6.8 bar)
Duty Cycle: Intermittent

Model Volts
Open Flow
gpm (lpm)
on / off 
Amps @
10 psi (0.7 bar)
BYPASS Packing Size
N.W / G.W
FL - 501 12 Vdc 1.6 (6.0) 40 psi (2.8 bar) 3.0 YES YES 335×130×110 2.10 / 2.40
FL - 502 24 Vdc 1.6 (6.0) 40 psi (2.8 bar) 1.6 YES YES 335×130×110 2.10 / 2.40
FL - 503 230 Vac 1.6 (6.0) 40 psi (2.8 bar) 0.7 YES YES 335×130×110 2.10 / 2.40

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