YHJIC No required! It allows you to clean the milk deposits and . The water will into the vessels and clean.The water will to clean the interior and exterior clearly and stop automatically when cup is moved .Great kitchen supply, efficiently save your and have a good with your families and .Perfect washing performance with cold water! The pitcher rinsers 't broke the glass and could clean the and other besmirch and clearly.Suitable for many types and sizes of glass/cup.Washing : High pressure washingMounting hole size: 22mmColour: Silver + black: Brass, steel and plasticPackage Contents:1 * Wash Cup Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.