Great product, great price especially compared to the previous I had paid more than 100 Hager and who not only was a non-standard diameter (> 52mm), but which proved very unreliable (self-priming after a few months) in short I am very satisfied with this purchase note also that this is a product Velleman (import course, I am aware that it is not designed by Velleman is clear but is selected by them, which is a guarantee of some quality).