This is a gasket for the thermos lid.
It must be assembled on the thermos lid to make the thermos leakproof.
After each use, please remove the gasket and clean with warm, soapy water. Please let dry completely before re-installing again. 
*IMPORTANT*
These spare parts will only work with the redesigned OmieBox® model. All spare part purchases are non-refundable. If you're not sure which version OmieBox you have, please email us at yumboxghana@gmail.com 
If you're unsure which model you have, please turn your box over.
On the back of the box, there is a square box with 8 alpha numeric characters.
If the code has the letters SD, it's the original model.
If the code has the letters CH, it's the redesigned model. 
If you have any questions, please contact us .