for Stanley Tumbler Adapter to Cirkul Flavors Cartridges, Fit for Owala Stanley Quencher 40oz Water Bottle Lid Replacement, Flavor Cartridges Adapter for Cirkul, BPA Free, Leak Proof, Cream (Lid Only)

Good top with good airflow make sure you have a 40oz screw on for it to fit easy to clean to and doesn’t leak good value for money

Got for my son's cup for great and does what I needed it to do

I bought this because the ones with the straws don't give you any flavor unless you turn the cartridge up high. Tipping it up isn't an issue for me. The problem I have with this adapter lid is that there is no air release. Every time I take a sip, I have to slightly unscrew the cap or cartridge to release the pent up air. Otherwise I can't get more water from it. I wanted to like this way more as I am not a fan or the adapters that require you to still use the cirkul lid for the cartridge. But this issue is a dealbreaker for me.

I was so excited to have this option for my Stanley but quickly noticed once I started taking some sips that it was getting harder to get anything out. I have to constantly mess with the cartridge part to keep it from being so air tight. This sadly is making me feel it was a waste of money.

Excellent it is a great adapter and now I drink even more water because it lets me use my Cirkul flavor cartridges.

Finally found a great straw top for my large cup. Definitely worth it

Just as described. Would buy again

This lid is perfect for my Stanley. No leaks and easy to put on and off!