That may be an artifact from the old days of pneumatics, and the manufacturer changed the spec afterwards? There are plenty of pneumatics with similar scenarios, and I think the only thing we can do is recommend modern alternatives, like you've done. I'm sure there are other parts & rules which are based upon what was available 8+ years ago. The GDC has done a great job modernizing the rules, and we as a community can continue to keep them on their toes

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For example, Festo makes some great 90 & 180-degree rotary pneumatics with an awesome form factor, but they're all only rated for 8 bars of pressure. I'm willing to bet it's 8 bars only because they rounded down from the actual safe value. This is 116 psi, therefore illegal in 2015. After Champs, I plan to write a letter to FIRST asking about the reasoning behind the number of 125 psi for all pneumatic parts. I bet it's because of this regulator you've listed - if it fails, then 110 psi goes to all parts downstream. Yet what if we were allowed to only store 105 or 110 psi of air for pneumatics - would that alleviate the safety concerns?