Orifice reducers are small cylindrical components that can be used to reduce the diameter of an opening or opening port. They have a tapered internal design allowing for a snug fit into the screw thread vial. They are particularly useful when working with smaller sample amounts or when using less volatile compounds that require greater control of sample evaporation. By reducing the size of the orifice, it reduces the amount of air entering/exiting the vial at any given time, which helps to limit sample evaporation. Orifice reducers are available in a variety of sizes to accommodate different thread vials, such as 13mm, 15mm and 18mm. They provide a safe and efficient way to use screw thread vials while preserving sample integrity.