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–– VERSATILE USE –– The key with a 5 mm internal square fits the valves of most standard radiators - Older finned heaters are usually not compatible. Small but fine – can also be used in smaller niches and corners – make sure to add enough space for your hand in addition to the tool length (4 cm). Higher heating performance – Regular venting increases the efficiency of your heaters, reduces heat loss and thus saves expensive energy costs. –– CLEAN WORK –– The emerging water automatically collects in the reservoir - preventing splashing and stains on the floor effectively. Well thought-out – The collection container is made of heat-resistant material. The top is equipped with a ventilation opening from which air can escape.