I hear there was a 3000psi yoke for the Mk5? I've got a Mk5 with the smaller yoke, but no LP tanks. I'm not entirely sure what I'd use the Mk5 for, but it bothers me to have stuff that I can't (reasonably) use.
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If the yoke were to fail, it would almost certainly just bend a little, causing a leak. It's not like the reg would come flying off.