ADEY Professional Heating Solutions


Central Heating System


Advanced chemical solutions from the market leaders in magnetic filtration

MC4 Leak Sealer is an effective high performance solution from the industry leaders in central heating system maintenance and water treatment.

It is designed to seal leaks and weeping joints and is suitable for all sealed and open vented central heating systems, old and new.

  • High performance leak sealer
  • Seals inaccessible leaks and weeping joints
  • Reduces pressure loss on sealed systems
  • Avoids costly maintenance repairs
  • No blocked pumps, valves or air vents

Sealing small system leaks and weeping joints, the silicone emulsion sealer, MC4, effectively reduces pressure loss on both sealed and open-vented systems.

Available in 500ml bottles.

Product data

How to use

500ml of MC4 will provide effective treatment for a typical 100 litre/ten radiator system.

To introduce MC4 to the system, we recommend using the MagnaClean® canister to dose the system. Alternatively, dose via a radiator or F&E tank.

N.B. NOT for use in single feed indirect cylinders.

Physical and chemical properties

Appearance: Viscous liquid

Colour: White/off-white

Odour: Slight

Solubility: Dispersible in water

pH (concentrated solution): 7.0

Relative Density: 1000 kg/cm³


ADEY is a carbon neutral company and cares about the environment. MC4 is classified as non-hazardous and while effectively sealing small system leaks and weeping joints, is non-toxic and biodegradable.


EN 9001 & ISO 14001

Health & Safety

Keep out of reach of children. Not to be taken internally. Avoid contact with eyes and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.