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Fits all ThermoFlask® Chug Lids and Spout Lids.
Two O-Rings are included in the pack.
One large O-Ring fits inside the lid.
The smaller O-Ring fits in the drinking spout cap.
If your lid has a fitting for a straw, see: https://mythermoflask.com/collections/frontpage/products/straw-lid-o-ring-2pk
O-Ring installation instructionsNote: This item ships via USPS First Class Mail. There is no package tracking.