Steel tanks are available either in low pressure (LP) or high pressure (HP) versions.  Low Pressure Steel scuba tanks can use standard yoke style valves, but are larger than HP Steel tanks of the same capacity.  High Pressure Steel scuba tanks require a DIN tank valve and DIN regulator first stage, but are smaller than LP Steel tanks of the same capacity.

Yoke style valves are the most common tank valves by far.  Yoke style valves are generally found on aluminum tanks and are frequently used on LP steel tanks as well.  Yoke style valves are typically on-off valves, which simply open or close to control the flow of air from the scuba tank.  These are sometimes referred to a K-valves.

DIN valves are generally required on all scuba tanks with a working pressure of 3300 psi or higher.  DIN valves are also on-off valves, but have a different connection with the regulator first stage.  DIN valves have a treaded female connection, which mates with a treaded males connection on a DIN regulator first stage.  This threaded connection has the ability to handle higher tank pressures above 3300 psi safely.

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