Generic AstrocapsNY Popper Topper Leakproof Aroma Bottle Cap - Black USA Sized 19.5mm Thread

Works well, easy to use, no spills

It does the job well when it works. No spilling/leakage, and perfect for easy, single-hand use. However, I've now gone through 2 of these within a month. Even with gentle, casual use, they break after a couple uses.

The plastic is too fragile. If u do not pay attention, u will easily break it even when u r twisting it around the bottle. It leaks easily so keep the bottle standing all the time. No shaking or it will leak big time! Do not leave this inhaler all the time but replace it with the true cap when game over. The open/close mechanism was hard but soften with a bit of lubricant 🙃 Too expensive for the quality. Too bad the store does not deliver other models to Canada

This is super easy to use, and fits right on. There is a LITTLE leakage, just just have to be careful and be sure the seal is all the way closed.

No leaks and stays on even with sudden movement! Exactly what I was looking for and good quality.

Easy to use, will work for some bottles, others not so be sure to pay attention to what you buy vs what this will thread to. Fits easily into nostrils and close for non use. Best fit and function so far!

Used once it worked. Second time leaked everything out of bottle. Huge mess to Clean Up. Can't return it . Don't waste your money. Good idea. Why is it so hard to make?. Wrong plastic I guess.

I have been looking for a quality cap for a while and I finally found one. So far it has been leak proof and the design seems durable at the moment. I finally have a product that I can stuff in my bag without fear of leakage.Will provide an update on the durability.