This is the atypical valve style with the valve handle on the opposite side to common tank valves. It is popular for sidemount diving or stage tanks for use of tanks on the right hand side.
The tank valves make use of a recessed burst disc to prevent damage when penetrating wrecks or caves. The thread on the valve is a standard 3/4" NPSM thread that will fit most Australian tanks.
WARNING: If in doubt of which valve to order or which thread you have got, please email or call us before ordering.