When I received the bottle I poured some glue into it and tried to use it but the top cap wasn't tight enough allowing air to escape through the top without pushing the glue up the dispensing tube . . I noticed the o-ring in the cap looked a bit dry so I smeared some lube on it and put it back on the bottle and it worked. The top now seals really well and pushes the glue out like it should. Handy little device.
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