Sea-Dog Rectangular Motor Flush - P/N 521520-1

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RRP$9.50 $8.55
(You save $0.95)
Unit of Measure
Alternate Products SKU
"5-53302", "3-521520-1"
Manufacturer Part Number (MPN)

The practice of a technician putting chemicals in the engine oil to break down sludge or carbon deposits from old oil is known as an engine flush. After removing a tiny amount of oil from the engine, the non-solvent flush additive chemical is added, and the car is left to idle for 5-10 minutes before being driven. The Outboard Rectangular Motor Flush removes salt, sand, minerals, and contaminants from the cooling system of your bottom unit, increasing the engine's life. Easy-to-use molded PVC cups deliver fresh water to the cooling system through side intakes on the lower unit. For use with larger outboards, the cups are rectangular.

A spring-loaded clamp holds the universal rectangular cups over the engine's intake while a single garden hose is to supply fresh water. The Motor Flusher is also a helpful tool for doing tune-ups and other maintenance tasks.

Key Features:

  • Flushing motor in a rectangle
  • Made by Seadog Line, Inc.
  • 13 inches wide by 4 inches deep by 1 inch high


  • SKU: 3-521520-1
  • UPC: 035514521437
  • Weight: 0.84 LBS
  • A: 10 3/16"

Molded PVC/Painted Steel

This product replaces:

    521520-1, 521520, 3-521520, 35514521437

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ProPride 3P Hitch, Hassle Free, 60-Day No Risk Guarantee

You can return the 3P Hitch at any time during the first 60 days of use for a complete refund. That's a 100% risk free guarantee. 60 days begins when you receive the product unless otherwise arranged for a later date. We must receive the product in Holly, MI in 60 days or less. To initiate a return you can contact us for a return merchandise authorization. If the hitch was purchased during a FREE shipping promotion, $299 will be deducted for any returned hitches.


We can ship to virtually any address in the Continental US. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.)

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.

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