All Parts Are Dishwasher Safe For Convenience,The One-Piece Silicone Spout Is Easy To Drink From: Liquid Starts Flowing When Pressure Is Applied To The Spout.The Valve Is Built Into The Spout, Ensuring Assembly Is Fast And Hassle Free.Container Of The Sippy Cup Is Designed To Allow Easy Grip For Little Hands.All Philips Avent Bottles And Cups Are Compatible Excluding The Glass Bottles And The Grown-Up Cup. So You Can Mix And Match To Create The Perfect Cup, Suiting Your Toddler'S Individual Development Needs.