Porex blood serum filter push ring

Push ring for inserting Porex blood serum filters  https://www.porex.com/life-sciences/laboratory-filtration/sample-preparation-devices/serum-filters/ into 16 mm OD tubes. 

Put your thumb into the ring and use it to push blood serum filters down into tubes without hurting your fingers in the process. This is great for when you have large numbers of liquids needing filtering.

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