Okay, it's not perfect, and like me you will read, it's a soft rubber gasket where the 'universal' water bottle thread goes located . They should be more open and show that part. It doesn't screw on tightly like a bottle cap. Remember what you're using it for, that "Oh shoot!" moment, I've got something in my eye and I need it now! My kids get things in their eyes and cry! One hand on the water bottle and the other on the neck! The harder you press, the more water is washed out. I did a wet run and my kids did it. 9-7-5. They liked it when I held the eyecup over the eye and made them open the eye. I bought two and taped each to the water bottle in both bathrooms. Great purchase, just hope they improve the printing a little bit better.
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