It feels very durable. I use it by pushing it into the inner black frame resin part with a patch, but even if I push it from directly above, it is difficult to fit it all the way in, but at first I thought it would be difficult to insert it, but if I attach it from the side without a removal hole I went smoothly. Switches are not so, but double outlets are quite difficult to remove when changing.
(Translated by machine.)

It was used in the airtight specifications of the house maker, and it was helpful because I could get Jimbo Electric, which is not available at the local hardware store, and also purchase the airtight packing. Made in Japan, which is rare nowadays!
(Translated by machine.)