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This X200 boiler noise reducer from Sentinel is extremely effective at solving problems of boiler noise, most often caused by a thin layer of deposit on the heat exchanger, whilst simultaneously helping to restore boiler efficiencyFeatures & Benefits: Sentinel X200 Boiler Noise Reducer - 1l, Reduces boiler noise, Helps restore efficiency, Easy to handle, Simple to dose, Suitable for all metals including aluminium, Non-acid, non-corrosive, Manufactured under a quality system conforming to IOS9001, 1 litre. Sentinel X200 Boiler Noise Reducer - 1l 50015110