Protecting and sealing from the inside, it can infiltrate really hard to reach places, reducing the need for a more costly repair. 

One dose could be all it takes to fix the leak and restore pressure.

A 500ml bottle will provide effective treatment for a typical 100litre/ten radiator system. 

For larger systems, use further MC4 as required. 

Non-hazardous, non-toxic, biodegradable substance. Suitable for all heating systems.