I had bought this ASA for my etek 5 because I was really sick and tired of having to twist that stupid little nozzle every time I wanted to air up and de-gas my gun. Now all I have to do is press a button to de-gas and click that little slider in place to air up. They are a little pricey, but in my opinion it's totally worth it. They make your life just a tad bit less strenuous. Macro Lines in general are just kind of a pain in the butt.
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