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March Pumps LC-3M-MD / PML500 - 510 GPH - 115V - Submersible A/C Pump

MARCH PUMP LC-3M-MD- American submersible seal-less centrifugal magnetic drive pump. 115V - 50/60HZ - 8.5GPM (490 GPH). Can be used submerged or not submerged. 3/4"FPT Inlet, 1/2"MPT Outlet. Rated up to 510 GPH (1930 LPH) flow and for heads up to 19 ft (4.3 m). Commonly used for marine air conditioning and fountains. Replacement for Dometic PML500 Pump (part number 225500005, 336183). Upgraded model c5omes with Marine Base, 3-Flat Stainless Steel Shaft, Carbon Impeller Bushing

Reference: LC-3M-MD / PML500 115V

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MARCH PUMP LC-3M-MD Mag-Drive Centrifugal Pump 115V / Replaces Dometic PML500 Pump

LC-3M-MD Marine Pump

The March Pump LC-3M-MD Mag-Drive Centrifugal Pump 115V is an American centrifugal magnetic drive pump, which eliminates the need for a shaft seal. It is capable of generating a maximum flow of 8.5 gallons per minute at 4 feet, and its maximum head is 19 Feet (8PSI). The standard wet end (the materials that come into contact with the solution) is composed of Polypropylene, Buna N, Cupric Nickel, Ceramic, and Ceramic Magnet. When submerged, Epoxy, Stainless Steel, Polysulfone, and the Cord are also in contact with the solution. The inlet connection is 3/4 inch female pipe thread, and the outlet is 1/2 inch male pipe thread. The standard motor is a 1 Phase 115V or 230V 0.05 Horsepower motor, which can be run on either 50 or 60 hertz, with performance differences between the hertz options. Comes with Marine Base, 3-Flat Stainless Steel Shaft, Carbon Impeller Bushing.

The March LC-3M-MD pump may be used submerged or not submerged, and can handle fresh water, salt water, and mild chemicals. Pumps are serviceable with a screwdriver. The “LC” is hermetically encapsulated and liquid cooled which allows the pump to be run fully submerged or in open air for complete moisture protection. Direct Replacement for Dometic PML500 Pump 115V, Part Number: 225500005, 336183.

Features of March Pump LC-3M-MD

  • Magnetic-drive impeller means no seal to wear, leak, or repair.
  • Efficient motor with low power consumption.
  • Exclusive marine-grade base is built to handle harsh marine conditions.
  • Liquid-cooled (submersible).
  • All components in contact with water are plastic, ceramic, or stainless steel.
  • High Capacity Centrifugal Pump.


Motors are available in different electrical configurations such as 115 Volt 50/60 Hz, or 230 Volt 50/60 Hz, 1 phase. The motors are U.L. listed and rated as continuous duty. Models have a 6 foot (1.8 m) cord.

Limited Warranty

March pumps are guaranteed only against defects in workmanship or materials for a period of one year from date of manufacture pumping water. For the complete warranty and to register online go to

About the Dometic PML500

The March Pump LC-3M-MD is a direct replacement for the Dometic PML500 pump (part number 336183). This Dometic pump provides a steady flow of cooling water throughout Dometic marine A/C systems. 


Part Number March Pump LC-3M-MD
Dometic Equivalent PML500 (225500005)
Max Flow 8.5 GPM / 32.2 LPM
Max Head 19 FT / 5.8 M
Max Internal Pressure 25 psi / 172 kPa
Max Liquid Temperature 130 °F / 54 °C
Power 0.05 HP / 0.037 KW
Voltage 115V 50/60Hz
Inlet 3/4"FPT - 1/2” MPT
Outlet 1/2"MPT
Submersible Yes
Dimensions (inches) 4.87 x 4.75 x 7.38
Packed Weight (lbs) 7.9
Applications Marine air conditioning and fountains

March Pump LC-3CP-MD


March LC-3CP-MD Dimensions

Operation Notes 

Pumps are not self-priming, lack a suction lift, and thus require a flooded suction. Pumps cannot be run dry because the impeller requires the liquid being pumped for lubrication. For liquids with a specific gravity greater than water, have a higher viscosity, or for elevated temperatures, a trimmed impeller may be necessary. For further application assistance, please contact March Pump.



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