I got lost in the overwhelming price difference of similar products of the Monotaro brand, but compare the pictures carefully and eventually made it here. The cause of the price difference is the root part. Monotaro brand is a monolithic structure and it becomes useless if the root plug is exhausted. This one can be removed and replaced with a separate plug at the base, and even if you wear on desorption, you can continue to use it if you exchange only the root plug. Perhaps in the long run this product may end up being cheaper.