Lezyne pump. Continental removable core. GET TO FUCK.
PRESS THE BLOODY BUTTON ON THE PUMP HOSE BEFORE UNDOING IT!
(if you don't have the hose with the button ask Lezyne nicely for one :)
That button lets air out. The valve core still unscrews.
@Howard started
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Lezyne pump. Continental removable core.
GET TO FUCK.