It is impossible to tighten the cap to close my Dopper
It's unfortunate that the cap of your Dopper cannot be tightened to close it. This flaw may occur when the cap and cup have been closed too tightly. Once this has happened, you cannot undo the problem or fix it.
Please contact us through the contactform. We would like to send you, for once, a new cap!
We will get in touch!