This is the replacement septa only. Does not include the screw cap lid.
To replace a septum, push the old septum out of the cap and discard.
- Insert the new septum with the white side facing the cap’s hole. Be sure to seat the septum as evenly as possible using a pencil eraser or something similar.
- To ensure proper seating, tighten the cap onto a vial, loosen, and tighten again. Remove and inspect the cap to be sure the septum is evenly seated all the way.