These GMS press in bottle adapters make dispensing liquid medications into a syringe simple and accurate. The adapters are made specifically to work with liquid medication containers. Bottle syringe plugs help accurately and easily dispense the proper dosage of medication by providing stability to the syringe. Simply press the proper sized adapter into the bottle opening and enjoy the ease of measuring your liquid medication. Adapters will not get in the way of the bottle cap and the lid will still seal properly while the adapter is in place. The adapters come in a variety of sizes for your differing needs. We recommend measuring your bottle neck opening so that you purchase the correct size so that it will fit securely into the bottle. This size (28 mm) is made for 12 and 16 oz bottles.