Tiny rubber stopper thing on kids HydroFlask straw top. Not sure

My kid's bottle top is missing the little air valve. Where can I get the replacement rubber valve? : r/Hydroflask

40 oz Wide Mouth: 40 oz Insulated Water Bottle

The new flex straw lid designed for wide mouth water bottle. Compared to the traditional straw lids. The new straw lid highlights the following features: 1. New lid BPA-FREE. Put it in the bag or the car. No need to worry about the trouble of leakage at any time. Convenient sucking nozzle. Make drinking water faster and easier. 3. The lid and straw can be installed and separated at any time, easy to carry and clean.

Wide Mouth Straw Lid 2 Straws and 1 Brush and 2 Protective Pads. Fits Most Sports Water Bottles. - Black

Enjoy optimum drinking temperature for hours: Our TempShield double wall, vacuum insulated technology guards the temperature of your drink. It also

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