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The Butyl Rubber stopper perfectly matches with the safety cap thus no separation occurs between stopper and cap during decamping. It contains 3.2% sodium citrate as its anticoagulant. There is no anticoagulant or additive inside the tube.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.