12mm Smooth Flow Tap with 38mm Plug-fit Screwcap : Self-venting or air-returning tap that provides glug-free dispensing from rigid, single-opening (unvented) containers. Screws onto 38mm externally threaded opening. Ideal for fridge bottles serving water, fruit juices, etc. PE, PP components. Typical applications include but are not limited to: water, juices, beverage, chemicals, essential oils, liquid food.