Designed for maximum flexibility, these adapters have open-top caps that provide vacuum-tight seals for the entrance of thermometers, syringes and pipets. Sizes are available to accommodate items with ODs between 5.5 and 10.5mm. The compression cap and internal, FKM O-Ring allow complete control of the immersion depth of the inserted thermometer or other item. Replace the O-Ring with a liner and the adapter becomes a septum port for syringes.