Please be sure to check stock before purchasing. If there is no stock, we cannot ship and will have to cancel. This was a gift from my brother, but I am not knowledgeable about it and don't understand anything. Please judge from the images and only purchase if you understand. The key number is 794 and it opens, but it has a quirk and is difficult to open, but it will open if you jiggle it. The plastic part of the hose for the jacket in the 13th image is slightly sticky. Please judge everything from the images and only purchase if you understand. Please refrain from purchasing if you are a nervous person who seeks perfection. As I am not knowledgeable and ignorant, there will be no warranty to prevent trouble. #Diving Diving set Mares ABYSS Regulator Ya