12MM PTFE/SI SEPTUM 1000/PK 12020143 (EA)
https://www.knockoutrat.org/shop/rw2-1030-51464-12mm-ptfe-si-septum-1000-pk-12020143-ea-313040
https://www.knockoutrat.org/web/image/product.template/313040/image_1920?unique=07fba14
This 12MM is guaranteed a 12MM with the use of 12020143 and directly supplied to your lab by Gentaur's warehouse.
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Shipping: 2-3 Business Days