“Dont do what I did and fiddle with the parts before reading the instructions. I didnt realise it has a strong magnet and I got them stuck together. Took quite some effort to get them apart. Really pleased with the product. I like how I can wriggle the magnet from the outside to adjust the position slightly. My old circulation pump stuck to the glass but it would fall off during cleaning maintenance and now the sucker doesn't want to stick to the glass anymore. This new one can take accidental bumps and still stay put. Very pleased:-)”