Tumbler Adapter Compatible with Stanley and Flavors Cartridges | Fits 40oz & 64oz Stanley Quencher H2.0 Tumblers | Direct Fit, Food-Grade Leak-Proof Silicone (Black, 40 oz/ 64 oz)

Fits perfectly. Works really well.

Fits perfectly, no leaks, and way better flow than the stock one.

Like the handle on it cuz it gives you two ways to pack your cup or if you have a cup without a handle it gives you a way to pack it but overall could use a little Improvement takes a lot of work to put together to get it to go together properly for a Tight Seal didn't work for the person I was buying it for but I've used it some it's okay just felt like I went through my flavoring way too quick with it or it took way too long to get the flavor like I had to set it way too high

So excited when it finally came in so I could use my tumbler with my circkul flavors. I was highly disappointed when I could not use the straw part with the cartridge, when I tried to use it with out the straw it leaked around the cartridge.

Fit perfect & works great!

I have a 40 oz tumbler with a screw top lid I thought why not. It for my tumbler and I was able to put my Cirkul cartridge in with no issues. I used to the tip method. I’m not saying this will work on all random tumblers but it definitely worked for mine.

I recently ordered one but it didn't work too well for me but got it replaced and it's awesome I love this and would definitely recommend. I love the extra handle o. The top you can also hold it from there. And even use and attachment to carry around.fits well with my 40oz Stanley cup

This lid fits the Stanley perfectly. Little bit confusing on how to get it set up to start with but once we got it set up Brooks really well. Does not leak if it tips over.