Got a bunch of these caps to put on a bunch of existing Spec bottles. Nothing much to write - they perform as intended. Sadly, same can't be said about a bunch of new bottles I got at the same time, with two different cap valve designs, both unusable. Had to use these caps instead.

Easy to open and use, doesn’t leak when closed - the way a bottle cap should work!

I bought these to replace the caps on my Purist bottles. These are not a Moflo lid. They barely open and the flow is restricted. The plug wants to push back in too easy. If you need a new cap just throw the bottle away. Don't waste your money on these.