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Re: Improved S-Knob

> Orin,
> Are you saying that with the check valve and with the engine in a vacuum
> condition (idling, Shfiting etc) that there is vacuum on the bottom of
> the W/G and no vacuum on top which could damage the diaphram?

Without the check valve, I don't believe you would normally get pressure on
top and vacuum below.  Flexing the diaphragm in the opposite direction
is going to reduce its lifetime... though you probably wouldn't be
able to tell since they die kind of randomly.