Our 28 mm LDPE Push-in Orifice reducers easily press into the opening of a plastic bottle, allowing for more precise dispensing. Fits securely in any plastic bottle with a corresponding 28 mm or 31 mm neck finish. Reducer sits flush with the bottle opening so that the original cap can be placed on the bottle. Will not work with polycone lined caps. Not recommended for use with glass bottles. Please test the orifice reducers with your bottles to ensure proper fit and performance.