MANNOL 9966 Radiator Leak Stop for Cooling System - 325 ML

Radiator Leak Stop Additive – Cooling System Sealant for Engine & Heater Core

Cooling system leak sealant for radiators and heater cores. Stops small leaks in aluminium, copper, plastic, and composite systems. Safe for all liquid-cooled engines.

Product Description 

• Cooling System Leak Sealant: Special additive designed to seal minor leaks in engine cooling systems and interior heater circuits.
• Universal Compatibility: Suitable for all liquid-cooled internal combustion engines (petrol & diesel).
• Multi-Material Safe: Works with aluminum, copper, plastic, composite, and mixed-material radiators.
• Advanced Sealing Formula: Contains metal polymers and special fibers that effectively seal leaks from the inside.
• Non-Invasive Repair: Eliminates leaks without dismantling the cooling system.
• Heater Core Protection: Safe for interior heating systems and narrow coolant passages.
• Easy to Use: Simply add to the expansion tank or radiator—no special tools required.
• Emergency & Preventive Use: Ideal for temporary repairs and preventing further coolant loss.