The other person is also gathering, but there was no flow arrow on the IN-OUT display or main body on the port, and it was necessary to look up the catalog on the manufacturer's website. I do not want it until the engraving, but it is saved if you can attach IN - OUT letters or sticker stickers or catalogs or instructions etc. Cost performance is outstanding.
Since IN - OUT is not written on the main body, it was necessary to look for the manufacturer 's page and see the catalog. I want you to use general arrow notation or let IN-OUT be written in letters. The thing itself seems to be good for the price.