Hero image 0 of Bar's Leaks Block Seal Liquid Copper Coolant Leak Fix, Antifreeze and Coolants, 18 oz, 0 of 9
Bar's Leaks Block Seal Liquid Copper Coolant Leak Fix, Antifreeze and Coolants, 18 oz
Key item features
- Leak Repair: Permanently fixes cooling system leaks, including larger ones that regular stop leaks may not address.
- Coolant Compatibility: Compatible with all types of 50/50 mix antifreeze, including traditional and extended-life coolants (yellow, orange, pink, red, blue, purple, green, silicate, and non-silicate based OAT/HOAT).
- Application Versatility: Suitable for all vehicle types, including cars, trucks, vans, SUVs, and RVs.
- Easy Application: Features a one-step formula that pours directly into the radiator, requiring no draining of the cooling system.
- Material Sealing: Seals leaks in plastic, aluminum, and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores, and radiators.
- Enhanced Strength: Fiber additives combine with the liquid to increase strength and promote a permanent seal.
Generated by AI
Specs
- Antifreeze & coolant typeOAT
- Compatible carsUniversal
- MaterialCopper
- Rec. useAutomotive, Fleet Vehicle, RV, Truck
- Size18 oz
- Vehicle fitment typeUniversal
Reviews summary
Pros
- : Directions are simple and straightforward.
- : Offers cost-effective solution compared to alternatives.
- : Forms a strong seal on radiator and intake gaskets.
Neutral
- : Can be effective, but may not seal larger gaps.
Generated by AI
Current price is USD$7.97
Price when purchased online
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Columbus, 43215
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About this item
Product details
Bar’s Leaks® Liquid Copper™ Block Seal Intake & Radiator 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 cooling system 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.
- Bar's Leaks Block Seal Liquid Copper Intake Radiator Stop Leak 18 oz
- Permanently Fixes Cooling System Leaks
- Antifreeze Compatible-No Draining Required
- Compatible With All Types of 50/50 Mix Antifreeze
- One Step-Pour Directly into Radiator-Easy to Use
- Use With ALL Types of Traditional or Extended Life Coolant
- All vehicle types
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.
Specifications
Antifreeze & coolant type
OAT
Compatible cars
Universal
Material
Copper
Rec. use
Automotive, Fleet Vehicle, RV, Truck
Directions
Instructions
. Directions:. ➊ Allow engine to cool. Make sure engine is cool enough so radiator cap can be safely removed. ➋ Shake well. Pour Liquid Copper™ Block Seal directly into radiator. If using in a small cooling system, such as 4 cylinders with no air conditioning, install 1/2 of bottle. Tip: If you do not have access to your radiator, remove top hose where it connects to the top of the radiator and install product in hose. Reattach hose and tighten clamp. If you have a pressurized overflow tank, you can install in tank. ➌ Fill radiator and overflow tank to proper level and reinstall radiator cap. ➍ Turn heater on hot and fan on high. ➎ Start vehicle and idle engine for 5 minutes. ➏ Turn vehicle off and allow engine to cool. ➐ Top off radiator and leave Bar's Leaks® Liquid Copper™ in cooling system for continued protection. Drive vehicle as normal.
Safe Handling Instructions
DANGER: Opening the cooling system while the engine is hot or running may cause severe burns. NOTE: Cooling systems that are dirty or partially clogged should be flushed before usage. KEEP OUT OF REACH OF CHILDREN. CAUTION: Contains Sodium Silicate (Liquid Glass). Avoid skin and eye contact. FIRST AID: EYES - Flush eyes immediately with water for 15 minutes or until irritation subsides. SKIN - Wash with soap and water. INTERNAL - If swallowed, do not induce vomiting, call physician.
Warranty
Warranty information
1 YR REPLACEMENT IF DEFECTIVE
Warranty url
Warnings
Warning Text
DANGER: Opening the cooling system while the engine is hot or running may cause severe burns. NOTE: Cooling systems that are dirty or partially clogged should be flushed before usage. KEEP OUT OF REACH OF CHILDREN. CAUTION: Contains Sodium Silicate (Liquid Glass). Avoid skin and eye contact. FIRST AID: EYES - Flush eyes immediately with water for 15 minutes or until irritation subsides. SKIN - Wash with soap and water. INTERNAL - If swallowed, do not induce vomiting, call physician.
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Customer ratings & reviews
How item rating is calculated
Reviews summary
Pros
- : Directions are simple and straightforward.
- : Offers cost-effective solution compared to alternatives.
- : Forms a strong seal on radiator and intake gaskets.
Neutral
- : Can be effective, but may not seal larger gaps.
Generated by AI
Customer images
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Showing 1-3 of 324 reviews
Jun 23, 2013
fugitive059
5 out of 5 stars review
Verified Purchase
Great stuff for small leak
I replaced my water pump, and much to my dismay found another leak somewhere behind and below the pump. I was afraid that the head gasket might be leaking, and used Bar's liquid copper to try and abate the leak. I also removed the thermostat so that this product did not clog it up. This stuff worked great! I have put many miles on the truck without incident....I would recommend using this product should you not want to invest in having head gaskets replaced.
Helpful?1WF35K7VNWTJ23554602
Oct 1, 2025
Cliff
Item details
Multipack quantity: 1
5 out of 5 stars review
Verified Purchase
I've used it in many different vehicles as a stop leak and preventive measure over a 20 year span great product great value highly recommend
Helpful?1WF35K7VNWTJ23554602
Nov 2, 2025
WalmartCustomer
Item details
Multipack quantity: 1
5 out of 5 stars review
Verified Purchase
It's what I expected and all was good
Incentivized Review
Helpful?1WF35K7VNWTJ23554602
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