Tec 7 Plumb7 Heating System Leak Seal 750Ml | Plu740101296 Prevents and seals leaks fast and efficiently It does not clog or impair the flow Simple to use Prevents rust and corrosion 750ml Tec 7 Plumb7 Heating System Leak Seal 750Ml | Plu740101296 The Tec7 Plumb quickly seals heating system leaks and can be used on open or closed heating systems. It can also be used as a preventative, preventing rust and corrosion. Tec7 Plumb Leak Sealer 750ml can be used to repair leaks in closed, as well as open, heating systems. Features Can be used to restore leaks in closed as well as open heating systems Enhances the pump lubrication Suitable for use with most boiler types to include combi-boilers Prevents & seals leaks quickly and efficiently This product will not clog or impair the flow