The O-ring at the mounting part of the drain bowl of the air filter for the air cylinder that has been used for many years deteriorated and air leaked, so the replacement air leak stopped. (Of course, since it is a genuine product) It would be helpful if you could handle such small, low-priced parts that you wouldn't normally use. I was thinking about replacing the air filter, but it went up cheaply without replacing it, Mr. Monotaro.
(Translated by machine.)

I needed one for the required amount and two for the spare, but I was surprised when I opened it. 5 pieces x 2 for 10 pieces ... I would like you to display the number of pieces. This is even more so because it is a non-returnable item.
(Translated by machine.)