There is two valves to open a blue and a black one from the looks of it, you'll need to open both to pressurise it. Mind close one at least when you have filled it though.
Thanks for answering! Any idea which two? The closer (towards the top of pic) of the back ones?
@owl started
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There is two valves to open a blue and a black one from the looks of it, you'll need to open both to pressurise it. Mind close one at least when you have filled it though.