Use a CoolBox 2XT Extension Collar when keeping tall tubes such as 3, 4, or 5ml cryovials, 15ml or 50ml centrifuge tubes and blood collection tubes in the CoolBox 2XT ice-free cooling workstation.
Place in between the the base of the CoolBox 2XT system and the original collar. Magnets on top and bottom provide a secure connection to the base and original collar.
