Gas Management: Tanks, Valves and Accessories

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What is the difference between DIN "200 Bar" and DIN "300 Bar" fittings?

Outlet/Connector #13 is from Deutsches Institut Für Normung (DIN) standard #477 part 1 - for cylinders with test pressure ratings up to 300 bar and is commonly referred to in the US SCUBA industry by the slang term "200 bar", because most European dive cylinders with 300 bar test pressures have working pressures in the 200 bar range. Outlet/Connector #56 is from DIN 477 part 5 - for cylinders with test pressure ratings up to 450 bar and is commonly referred to in the US SCUBA industry by the slang term "300 bar", because most European dive cylinders with 450 bar test pressures have working pressures in the 300 bar range. The two designs are nearly identical, but the 300 bar valve outlet is deliberately deeper so the shorter 200 bar connector will not be long enough to seat properly. This is a safety feature to prevent connecting a low pressure device to a high pressure supply, but it works perfectly well to use a 300 bar connector with a 200 bar valve outlet. It's important to understand that the "200 bar" or "300 bar" descriptions are just slang terms that have nothing to do with the pressure ratings of the outlets and connectors themselves.

to read SCUBA Valves: Regulator Fittings, 200 vs 300 Bar FAQ and Cylinder Neck Threads.

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