Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiato

Bar’s Leaks Liquid Copper Block Seal really delivers. The one‑step formula makes it simple to use—just pour it in and let it circulate. Within a short time, it sealed a small radiator leak and stopped coolant loss without any complicated process or extra tools. The 18 oz. size is generous enough for most vehicles, and the copper formula feels more heavy‑duty compared to standard stop leaks. It saved me from an expensive repair and kept the engine running smoothly. For anyone dealing with minor intake or radiator leaks, this product is a reliable, cost‑effective solution that works exactly as advertised.

No more minor leaks . Water pump no more noise.

Did what it said and stopped a block leak in a 2007 Mazda 3. I only needed to use half the container, so I still have some left for another leak down the line. Not much else to say.

I had no idea what I was doing, but I just followed the directions and it worked perfect perfectly. No more leak.

Bars a is always a good product . Just used as stock this round.