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MC8500UL 1/60 HP Evaporative Cooler Pump

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  • Made to ensure normal operation even at low water levels
  • Motor features thermal overload protection for added safety
  • Base plate is removable to clean out debris
  • View More Details
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Product Details

About This Product

The MC8500UL Pump is designed for use in MasterCool single inlet coolers made by AdobeAir as well as other residential, 115-Volt coolers rated from 4,000 to 8,500 CFM of air delivery. It features a low level design ensuring normal operation even if the cooler's water level drops to as low as 1/2 in. and is UL classified for safety. The powerful 2 coil concentric motor delivers 360 Gal. per hour at a head height of one foot.


  • Can be used with all brands of roof-top and window-mount coolers
  • Motor has thermal overload protection and a flame-retardant housing for safety
  • Grounded plug for quick and secure connection to the cooler's junction box
  • Includes mesh pump basket, mounting bracket, and hose extension for older MasterCool coolers that might require additional pump hose length
  • Removable base plate for easy removal of debris
  • Click here for more information on Electronic Recycling Programs
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Product Information

Internet # 202053462

Model # 1442

Store SKU # 666311

Additional Resources

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Dimensions: H 8.5 in, W 4.5 in, D 4.5 in


Product Depth (in.)

4.5 in

Product Height (in.)

8.5 in

Product Width (in.)

4.5 in




Pack Size


Part/Accessory Type


Product Weight (lb.)

2.75 lb



Warranty / Certifications

Manufacturer Warranty

1 Year Warranty

Questions & Answers

Q:How many of this pump is needed for a one unit window evaporative cooler?
by|Jun 1, 2023
1 Answer
Answer This Question

A:  One pump is required per cooler.

by|Jun 1, 2023
    Q:Does this pump work on a windows unit
    by|Jul 23, 2022
    1 Answer
    Answer This Question

    A:  This pump will work with most window evaporative coolers. Check cooler manual to be sure.

    by|Jul 26, 2022
      Q:I have one of these . It died at 6 wks. Is there a warranty? Getting new one in morn.
      by|Jul 13, 2021
      2 Answers
      Answer This Question

      A:  Unsure as to warranty, but I've burned through four of these in one season. Not sure if build quality has dropped?

      by|Jul 14, 2021

        A:  Yes, this concentric pump is warranted for 1 year from the date of sale. Warranty is void if pump is abused, altered, water damaged (e.g. white calcification), improperly installed, or stored in a cooler winterized with a plastic cooler cover. Please bring our phone number, 800-350-3425, and the pump to your local Home Depot store and have them call us to verify the pump condition and to authorize replacement.

        by|Jul 12, 2023
          Q:It shows 4,000 to 8,500 but I dont see anything in the instructions on how to do this.
          by|Mar 29, 2021
          1 Answer
          Answer This Question

          A:  This pump was designed as a replacement for Mastercool / Arctic Circle coolers, with a water flow of 360 gallons per hour (gph), using 8" to 12" rigid media. There is no way to adjust the waterflow on the pump itself. You can use a restrictor clamp to pinch the line to lessen the water flow. Take a look at the cfm of your cooler and there may be a pump more suitable for your application, such as the 1150 pump for a 5500 cfm cooler with a gph of 240. It all depends on the cfm of your cooler.

          by|Sep 9, 2023
            1 found this answer helpful
            Showing 1-4 of 8

            Customer Reviews

            4.2 out of 5

            • 4.2 out of 189 reviews
            • 72% recommend this product
            Filter by:
            Showing 1-10 of 189 reviews
            • Verified Purchase
            utter expensive garbage utter expensive garbage utter expensive garbage
              Long lasting and sufficient power.
              • Verified Purchase
              Perfect replacement when my Master Cooler pump failed after last season. The price is just right as well.
              • Verified Purchase
              It was a direct replacement of a previous model
              • Verified Purchase
              • Verified Purchase
              • Verified Purchase
              These units will usually survive 2 season of continuous use. But hard water and extreme tempuratures eventually takes it toll. Easy to splice / wire into existing pwer supply. Provides enough water to saturate cooling media. Quiet operation.
              • Verified Purchase
              Been in use for a few weeks now. The pump has high water output and a quiet motor.
              • Verified Purchase
              • Verified Purchase
              Showing 1-10 of 189 reviews