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Fits the ThermoFlask® Straw Lid Only.
Two BPA free O-Rings are included in the pack.
If you have the Chug or Spout Lid, (two different sized O-rings and no straw) please see replacements here: https://mythermoflask.com/collections/frontpage/products/o-ring-for-thermoflask-chug-lid-no-tabs
O-Ring installation instruction
Note: This item ships via USPS First Class Mail. There is no package tracking.