Fits the ThermoFlask® Straw Lids, including Kids bottles sizes 14oz-64oz. DOES NOT FIT ThermoFlask® 17oz Travel Mugs or 32oz Tumblers. 

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.

O-Ring installation instruction

SKU# 81030

Note: This item ships via USPS First Class Mail.