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25% Off Online Orders of Select Parts and Accessories. Enter Promo Code 25PEP 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 25PEP 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 12/12/16. Online orders scheduled for in-store pick up must be completed by closing on 12/11/16 for discount to apply.

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

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  • Part #: G12BP|
  • SKU: 8985970

Available today

Pay in Store Available

    • Works with all types and colors of antifreeze coolant and/or water
    • Seals leaks and seepage
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.

Bar's Leaks Powder Radiator Stop Leak

Bar's Leaks Radiator Stop Leak Concentrate is specially designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. It has millions of tiny particles to permanently seal leaks in plastic, aluminum and metal radiators, heater cores, and freeze plugs. For most vehicles, leaks stop in only a few minutes.
  • Works with all types and colors of antifreeze coolant and/or water
  • Seals leaks and seepage
  • Lubricates water pump seal and inhibits rust and corrosion
  • Harmless to ALL plastics, metals, aluminum, hoses and connections
  • The same formula that's used as an EOM treatment by many automakers
  • Compatible with conventional green (silicate-based) and extended life red/orange or yellow (OAT) antifreeze
  • For preventative maintenance, use once a year to guard against future leaks
  • To keep your car running smoothly, check out our wide selection of trusted Bar's Leaks repair solutions and Rislone performance enhancement products
  • The Pep Boys Say: "Bar's Leaks Powder Radiator Stop Leak is ideal to fix troublesome leaks in your cooling system and prevent future leaks from occurring."


Rated 4.5 out of 5 by 8 reviewers.
Rated 5 out of 5 by Excellent Get the job done July 30, 2016
Rated 5 out of 5 by Stopped the pinhole leaks in my radiator Needed two tubes (as my system was 5 1/2 gallons) to fix the pinhole leaks. October 16, 2015
Rated 4 out of 5 by Stops the minor leaks before they become a problem Prevented a pinhole drip from becoming a serious problem. What was a pesky drip could easily have resulted in a major repair or replacement if left unchecked or taken to a shop. Added Bar's Leaks to the radiator and the leak has stopped and the car runs fine. No need for a costly repair yet. Sure it is a temporary fix but think of it as why throw away the whole apple when you can cut off the bruised part and eat the rest? December 21, 2014
Rated 4 out of 5 by Great Stuff Does the Job December 19, 2014
Rated 4 out of 5 by The only one to use. My neighbor told me to use this 46 years ago if ever I had a water leak. It is the best temporary fix. I like the silver better than the gold. After you fix your problem you will have to flush it out or it will clog your radiator sooner or later. November 28, 2014
Rated 5 out of 5 by This product is old standby It has been a very unique and solid product that works well. November 13, 2014
Rated 5 out of 5 by EXCELLENT PRODUCT EXCELLENT PRODUCT October 25, 2014
Rated 4 out of 5 by good Worked for me August 5, 2014
  • 2016-12-07 T08:19:11.930-06:00
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