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These press in bottle adapters are helpful for changing the size of the opening of prescription medicine bottles. Made specifically for liquid medication containers. Bottle syringe plugs help accurately dispense the proper dosage. They come in a variety of sizes for your differing needs. We recommend measuring your bottle neck opening so that you purchase the correct size. This is the smallest of the three sizes, 22 millimeter. These adapters come in three different sizes. This is for two, three & four ounce bottle containers.