Maybe next time I do this I'll pull one out first and see if I can find replacements that accommodate some standard sized wrench. As you said, 8mm and 5/16" work, but I've never come across a 7.5mm or a 9/32" wrench, which would seem to be what is needed.
At least all my bleeders were the same size and, for the first time ever, having taken the trouble to cobble together a proper cap to go with the pressure bleeder, I didn't end up with brake fluid all over everything. Guess now that I have the rest of this sorted I just wanted to have the perfect wrench, too.
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