What is an INT and what is a DIN fitting?
There are two different tank valve-fitting systems. The most common one is the INT (INT stands for international). There is an O-ring around the tank valve opening, which acts as a seal between the first stage regulator and tank valve. DIN fitting is mostly used in Europe and in technical diving. The DIN fitting is a thread fitting on the tank valve. You screw the first stage regulator into the valve. In this case the O-ring, which creates a seal between them, is at the first stage regulator. In USA, Australia, Papua New Guinea, Solomon’s, Micronesia and most Asian and South American countries regulators are sold with INT fittings and tanks are equipped with INT. In most European countries, regulators are sold with DIN fittings. If your regulator has a DIN fitting, make sure you bring an adaptor as well. This is very important, as dive operators do not have adaptors for hire.
