Go to the Structure of the valve to get a more complete specification.
Once you get the specifations, you should notice theat these Scuba connectors are similar to Medical tanks and PCP Air guns and Paint Ball guns.
The cylinder threads where the tank valve is to be attached is of M25x2 for ISO standard. 25 means its diameter is 24 mm. 2 could be the pitch specification.
Unfortunately there are also BSA tanks using the 3/4 x14, the 3/4 is the diameter in inch, and 14 specifies the pitch.
Smaller tanks use the ISO M18X1.5 thread. The 1L Smaco or Dedepu tanks use this thread.
To insert gas i to the cylinder, you use another connector. The female part is usually the DIN G5/8 connector. It is a screw-in type. Medical oxygen tank also use this connector. But Scuba also uses the Yoke type for pressures less than 200 bar or 3500 psi.
The Dedepu 1L tank uses another connector commonly used in PCP Air guns also, called 8mm connector.
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