Use a CoolBox XT Cooling Workstation Single Capacity Extension Collar when keeping tall tubes modules for 3, 4, or 5ml cryovials, 15ml or 50ml centrifuge tubes and blood collection tubes in the CoolBox XT Cooling Workstation, Single Capacity ice-free cooling system.
Place in between the base of the CoolBox XT system and the original collar. The collar is magnetized and easily adheres to the unit base.