Hi. What are the benefits of the other aluminum air tank? I have dreamed with having tank that I can swap on the fly and carry two extra ones to the mountains, instead of having to deal with the compressor. I have seen various small valves for tanks like yours (some with the trigger hammer) that I assume could seal the tank from loosing the air while stored. But I don't know the technology, I am just doing my homework before entering the PCP world. I am surprised though that other people have not done it already. Here are some small valve models:
https://es.aliexpress.com/store/1102605379?spm=a2g0o.detail.0.0.46ceFlG0FlG0RQ and a picture with an exmple:
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