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Bar's Leaks

Bar's Leaks 1109 Liquid Copper Block Seal, Intake and Radiator Stop Leak, 18 oz. | One Step, Safe for All Cooling Systems

  • Based on 1,268 reviews
Condition: New
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Availability: 12 left in stock
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Arrives Friday, Sep 26
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Size: Pack of 1


Features

  • PERMANENTLY FIXES COOLING SYSTEM LEAKS: . One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUVs and RVs.
  • ANTIFREEZE COMPATIBLE - NO DRAINING REQUIRED: Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators.
  • ONE STEP - POUR DIRECTLY INTO RADIATOR - EASY TO USE: Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required.
  • USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

Description

Bar’s Leaks® Liquid Copper™ Block Seal Coolant Leak Fix Stop Leak seals larger leaks regular stop leaks won’t. One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV’s and RV’s. Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators. Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required. Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

Material: Sodium Silicate


Brand: Bar's Leaks


Style: 1 Pack


Item Weight: 18 Ounces


Item dimensions L x W x H: 7.5 x 2.6 x 2.6 inches


Material: ‎Sodium Silicate


Brand: ‎Bar's Leaks


Style: ‎1 Pack


Item Weight: ‎18 Ounces


Item dimensions L x W x H: ‎7.5 x 2.6 x 2.6 inches


Compatible Material: ‎Ceramin


Water Resistance Level: ‎Waterproof


Item Form: ‎Liquid


UPC: ‎046087011096


Unit Count: ‎1.0 Count


Global Trade Identification Number: ‎96


Number of Items: ‎1


Surface Recommendation: ‎Copper


Manufacturer: ‎Bar's Leaks


Item Weight: ‎1.12 pounds


Product Dimensions: ‎7.5 x 2.6 x 2.6 inches


Country of Origin: ‎USA


Item model number: ‎1109


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎1109


Date First Available: November 1, 2007


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Sep 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Funciona inmensamente feliz
Size: Pack of 1
Compré una RV con el motor dañado después de desarmarlo me doy cuenta que tiene un pistón partido y dobló una biela pulo el cilindro pero quedaron marcas muy profundas en el cilindro colocó pistón nuevo y empacaduras nuevas enciendo el motor ya armado y quedó consumiendo coolant ya que al parecer el bloque estaba rajado no me quedaba otra opción que montar un motor nuevo pero buscando alternativas conseguí este producto lo probé teniendo fe en Dios que iba a funcionar y tal cual fue mi asombro que en menos de media hora el motor dejó de echar por consumir el coolant y problema resuelto este es un increíble producto todavía no salgo de mi asombro ... show more
Reviewed in the United States on June 10, 2025 by Deyvis
    • Working as intended.
Size: Pack of 1
Had a cracked radiator where I needed coolant damn near every 40~ish miles. So it was a pretty decent leak. No money to fix it properly, so I grabbed this. It's held strong for the last 2 months with no issues so far of gunking up my system. I drive a beat up '02 Honda Civic. If it wasn't a beater of a car, I'd be too reluctant to try it. But, glad to say it does work. ... show more
Reviewed in the United States on June 6, 2025 by Amazon Customer
    • Just follow directions. If you need more put a small amount in.
Size: Pack of 1
It may take more than one bottle. Also Its better if you don't put antifreeze if AFTER the Bars If it needs antifreeze, put in before. It is pretty good. And follow directions about letting your car run for a short time. Its all on the bottle. It works better than the "Stop Leak" by Bars.
Reviewed in the United States on May 30, 2025 by Pamela Walker
    • Unbelievable
Size: Pack of 1
Why did you pick this product vs others?: Amazing! Worked perfectly for me, waited for 2 months to make sure everything looks good before commenting.
Reviewed in the United States on June 26, 2025 by Saleh Jafari
    • Work fast
Size: Pack of 1
Review Image by johansel johansel
3 minutes After pouring half bottle into the radiator cap, it Magically it stopped the heavy leaking of coolant from my 2 radiators.
Reviewed in the United States on June 24, 2025 by johansel johansel
    • I was hesitant
Size: Pack of 1
I decided not to use it after conducting further investigations. Some people said it clogs up their coolant system causing more damage and money down the line. I decided to find the reason for the leak and was glad I did because one of my flanges was made out of plastic and it had a crack so I replaced that with metal. ... show more
Reviewed in the United States on November 28, 2024 by Seahawks4life
    • Would buy again
Size: Pack of 1
Worked great for me. I had a small leak in my radiator and this product worked. Really easy to use and fast acting.
Reviewed in the United States on May 18, 2025 by Love2shop
    • Did not work
Size: Pack of 1
Drain and Flush, put with new coolant and leak product , I follow instructions. Next day pin hole still leaking.
Reviewed in the United States on December 15, 2024 by David

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