The instructions inside the package do not correspond to the components. It tightens (against) with a bronze screw number 34 instead of 2 screws with 8mm nuts. There is no 34mm pipe wrench available in Greece to tighten the nut properly, you can only tighten the spirals by hand because a wrench does not fit (the battery base has a 1cm indentation inside the body). In case of leakage from the spiral-battery connection, you have to loosen it again because you cannot check for leaks and tighten the spirals further, as you first have to pass the spirals through the bronze pipe and then screw them into the battery, and then the bronze pipe into the battery, you no longer have any visual contact with the spiral-battery connection (photo). A bad connection system, close spirals without hot-cold coloring. It is not worth the 28.4€ that I bought it for. It is not suitable for a stainless steel Frankie sink due to its inadequate support.