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You can flip the cup seal in a pinch and get another 10+ years out of it if the seal is bad. But most likely it just loosened up on you. A lil light hold locktite in the brass piece that holds the cup seal will keep it from backing off on you again. It can loosen up on you over time if you don’t. You could use a small bit of Teflon tape if you don’t have thread locker but I prefer the thread locker especially when dealing with CO2 and oils.
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