Belatucadras, thank you for trying to help but that is the sort of information I was finding when I looked myself, it is unclear and confusing. what I need to know whether the male thread on the outlet from the valve is 5/8" BSP or not. The size of the thread to the cylinder itself does not matter. There may of course be different threads on the out side of different valves, this is what I am trying to clarify before buying the wrong fitting.
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