In the nearby home center, we do not find the things we want very cheaply and are very useful in shipping fast.
There is no problem concerning goods in a firm build.
There was insufficient confirmation before purchase. Since the inner diameter of the conduction path at the back of the inner screw is only about 4φ, pressure loss is concerned, so it is expanded to 6φ and used. If there is a little more inner diameter, finish processing accuracy is wonderful. If only pressure values are used, it is recommended.