That's what I thought.
It's a big air pump. If you open both ends, you need to tune but usually you are safe when only opening one end or the other.
Not a 100% rule but fairly close.
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April 13, 2016 -- The day Richard was speechless.
May your hands always be busy, May your feet always be swift.
May you have a strong foundation When the winds of changes shift.
May your heart always be joyful, and may your song always be sung,
May you stay forever young!
--Bob Dylan
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