🚀 Seal the deal—drive leak-free with one powerful pour!
1109 Liquid Copper Block Seal is an 18 oz. sodium silicate-based stop leak solution that permanently repairs leaks in cooling systems without draining. Compatible with all coolant types and safe for plastic, aluminum, cast iron, and copper parts, it offers a one-step, fiber-reinforced formula that seals leaks in radiators, intake manifolds, heater cores, and more—ideal for cars, trucks, SUVs, and RVs.
| Material | Sodium Silicate |
| Brand | Bar's Leaks |
| Style | 1 Pack |
| Item Weight | 1.3 Pounds |
| Item dimensions L x W x H | 7.5 x 2.6 x 2.6 inches |
| Water Resistance Level | Waterproof |
| Item Form | Liquid |
| UPC | 046087011096 |
| Unit Count | 1.0 Count |
| Global Trade Identification Number | 00046087011096 |
| Number of Items | 1 |
| Surface Recommendation | Copper |
| Manufacturer | Bar's Leaks |
| Item Weight | 1.3 pounds |
| Product Dimensions | 7.5 x 2.6 x 2.6 inches |
| Item model number | 1109 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 1109 |
M**X
Good Stuff
Works well. Had to use on a brand new replacement radiator that leaked at the crimped tank seams. would use again.
B**M
Works great
Fixed leak in my radiator on older car. Much cheaper than replacing it!
D**Z
Great product
This stuff is great it sealed a bad leak that I had
P**R
Just follow directions. If you need more put a small amount in.
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.
E**N
Fixed my leaky head gasket
I started noticing drips underneath my rather old car and knew it wasn't worth fixing so i did some research and bought this. I followed the directions carefully: drain some fluid, pour this in, idle for 15 min, and let it cool. After doing so i've noticed no more drips, it's only been about a week so i'll update after a while to let you know if it really lasts but so far it's been great.One note: After running this through the system I did have to clean out the overflow cap which the product had plugged thinking it was a leak. If you notice that when the engine is cool, your radiator hose has collapsed, that indicates negative pressure in the system, in other words it's not drawing fluid from the overflow: clean out the overflow lines and you should be all set.
S**E
I was hesitant
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.
S**O
I don’t like
“I tried Bar’s Leaks hoping it would fix a small coolant leak, but it didn’t work at all. The leak kept coming back after just a few days, and it even left residue in the system. It felt more like a temporary band-aid than a real solution. Honestly, I wouldn’t recommend it — better to fix the problem properly instead of relying on this product.”
A**R
Worked for my old pickup
Worked on an old Chevy luv
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