No more spills! No more messes! The best inserts available for syringe use. Inserts are self sealing, insert into your bottle of epoxy enabling you to insert a syringe for an exact and spill proof draw of epoxy. Syringes are color coded making it easy to avoid contamination. As you can see, there isn;t a rubber grommet- which means no contamination. The unique spiral fin design allows for adjustment in varying sizes of bottle openings. There is also a thoughtful lip design so the insert stops level at the top of the bottle opening- still allowing you to use your cap for closure and making it possible to retrieve the insert for future use.