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25% Off Online Orders of Select Parts and Accessories. Enter Promo Code FOUND25 in Cart

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25% Off All Online Orders of Select Parts and Accessories
Receive 25% Off Your Online Purchase. Use promotional code FOUND25 at checkout to receive discount. Not valid in combination with any other discounts or promotions. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Excludes the following categories: Tires, Wheels, Batteries, Powerstop Brake Kits, Oil, Antifreeze, Refrigerant, Truck Boxes, Vent Visors, Bug Shields and BRANDS: Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Thule, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, JVC, MSD and BBK Performance. Valid online until 2:59 am EST on 2/27/17. Online orders scheduled for in-store pick up must be completed by closing on 2/26/17 for discount to apply.

Free Shipping on Orders Over $50 or in-store pickup

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  • Part #: ASLC16|
  • SKU: 8379719

Available tomorrow

Pay in Store Available

    • Stops Radiator Leaks Safely, Quickly and Easily
    • Compatible with ALL antifreeze and coolants
PayPal available for online purchases. Major credit cards accepted online and in store. Pay online, in-store or take advantage of our Pep Boys credit card. Learn more and see additional details in cart.

AlumAseal 16oz AlumAseal Radiator Stop Leak

AlumAseal has been sealing radiator and heater core leaks for over 75 years. AlumAseal is safe for all cooling system parts and is compatible with all antifreeze, including extended life coolants and DEX-COOL.
  • Stops Radiator Leaks Safely, Quickly and Easily
  • Compatible with ALL antifreeze and coolants
  • Safe for all metal, plastic, and rubber cooling system parts.
  • GUARANTEED to work


Rated 3 out of 5 by 2 reviewers.
Rated 5 out of 5 by Radiator Stop Leak Does a good job of stopping minor leaks in radiators September 20, 2016
Rated 1 out of 5 by No Value It's not effective on any leaks around the seal. November 1, 2015
  • 2017-01-22 T16:14:43.337-06:00
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