There's a couple reasons I can think of it being there. Maybe the plenum has a shoulder that sets up against it? It also adds a tiny amount of volume but I wouldn't over think that. These are only guesses.but there was a large washer between the original air cylinder and the valve housing which i did not keep when i put my new 700cc bottle with the new bottle adapter and new power plenum
was i supposed to keep it?
i thought the plenum was not using enough threads with this washer as without it so i threw it in the bag..
maybe it should go back on the gun?
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