If like me you know where the problem is and you're not afraid of you will stick it's a much more cost effective solution than a single intervention of a plumber! The diameter is smaller than what I thought by buying mails it works perfectly fine (and suddenly takes up less space). Much more convenient than the garden hose I was using before, it advances all alone inside the pipe cleaner. Ideal for lead but also to maintain and clean in order to avoid new plugs.