Our highly concentrated MC4 is an incredibly effective way to deal with small leaks. 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. Technical Specifications Physical and chemical properties Appearance: Viscous liquid Colour: White/off-white Odour: Slight Solubility: Dispersible in water pH (concentrated solution): 7.0 Relative Density: 1.06 g/cm³ Environmental Non-hazardous Non-toxic Biodegradable Quality EN 9001 & ISO 14001 Installer Benefits High performance leak sealer Reduces pressure loss on sealed systems No blocked pumps, valves or air vents Suitable for all heating systems Can be dosed through the MagnaClean® filter Available in 500ml Subject to availability in certain countries