Radiator Stop Leak

Stops Leaks up to 0.9 mm

Prevents Future Leaks

Will not Clog the Cooling System

Protects the Cooling System


Bar’s Radiator Stop Leak – Specially formulated to seal minor leaks up to 0.9mm in size occurring in the cooling system. Bar’s Radiator Stop Leak works on plastic, aluminum, and metal radiators. Bar’s stops leaks in heater cores, engine cooling jacket, gaskets (including head gaskets), and freeze plugs. In addition, Rhizex particles reduce cavitation by breaking-up the ultra-low pressure cavities, and reduce or eliminate the internal micro-implosions.  


  • Stops & prevents internal and external leaks up to 0.9 mm in size

  • Will not clog cooling system

  • Prevents Future Leaks

  • Contains buffing agents to keep system clean

  • Reduces damage associated with cavitation

  • Compatible with all antifreeze brands

* Packaging and or label graphics may vary

Product Code: RSC1L-BSS200
Bottle Size: Net.Wt. 6 fl.oz. (200 mL)

See: Safety Data Sheet(SDS) / Technical Data Sheet (TDS)