Different types of DIN tank valves
There are two different types of DIN tank valves: the 5-thread (232 bar) valve and the 7-thread (300 bar) valve. The vast majority of modern scuba regulators with a DIN connection have seven threads for the 300 bar valves, but they will work just fine in the 232 bar valves too.
The deeper 300 bar valve is physically too large for a yoke clamp to fit over, so divers with yoke regulators can’t use these tanks. Although there is an adapter that will allow a 300 bar DIN valve to connect to a yoke clamp, these adapters are designed for filling stations only and are not considered safe for use during a dive. In contrast, the 232 bar DIN valves are not as deep as the 300 bar style and as a result they can accept an insert that essentially converts the valve to work with a yoke regulator.
So when shopping for a tank valve, look for 232 bar DIN valves (sometimes called “pro valves”) as they can work with a regulator of either connection type!
Drawbacks of DIN connections
Depending on your choice in regulator, the DIN option might cost a little more than yoke. Since yoke valves are much more common among rental tanks in some areas, it’s a very good idea to pick up a yoke adapter…. which adds a little more to the total cost.