[martin417]

Originally Posted by GeeTwo

Q&A has consistently refused to rule a part legal unless it's recommended or mandated. You'll probably have better luck if you word the question to ask if the function of the part is consistent with a short list of rules, with reference to your part as an example of one that performs the function.

Here is the exact question and answer from (edit) 2014:

Q34
Q
.Is a quick release valve, such as the one sold by Bimba (part number 1BQEV), considered a flow
control valve, and thus a legal pneumatic component per Rule 77 (F)?
A
.Quick Exhaust Valves are not included on the list of permitted items in R77

Which is the basis for my argument. They are still not included in the list of permitted items, but we are being told by a LRI that they are legal because check valves are now in the list.