I'm fairly sure it's all standard 1/4 BSP. Which should be easy to determine from the threads on the tank and changeover valve.
Gas/pipe threads can be confusing but in a nutshell:-
1/8 BSP = 3/8" actual outside diameter of thread
1/4 BSP = 1/2" " " " "
3/8 BSP = 5/8" " " " "
Ron
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