Press-in Bottle Adapter, 28mm. Converts a standard prescription bottle into a filling device. This plastic insert is pressed into the bottle opening. Use an oral syringe to draw liquid from the inverted bottle, then replace original cap with the insert still in place. Fits most drug manufacturer containers with a cap finish of 28mm, and our TPS plastic ovals (12 & 16 oz) and Pharmacy Lite plastic ovals (12 & 16 oz), plus #7554 4-oz amber glass Boston round bottle. Call for a sample to ensure it will work for your application. Non-sterile. 20 per package