I bought it thought that it was a good product, but when I went to a nearby mass retailer 's home center, the price was around 600 yen cheap so I was disappointed. It is still good if it is a little bit, but since Monotaro is also a business, there is no choice.
It is a good thing with less flow resistance. The improvement point is that the packing seal of the joint joint is easy to disengage. Once installed, there is no problem, but it will be lost when you remove and move. I would like a structure to prevent packing dropout on the joint.