This replacement spout is ONLY suitable for the following NUBY branded cups (will not fit any other cup) 1. Nuby No-Spill Easy Grip Cup, 10 Ounce, Colors May Vary, 1 pack (item # 890) and 2-Pack (item # 891) 2. Nuby 2 Piece No Spill Easy Grip Trainer Cup, Blue (item # 80316) and Pink (item # 80317) 3. Nuby 2-Stage Busy Sipper Pop-up Cup, Colors May Vary, 6 months+, 12 oz (item # 10229) Made from soft durable silicone with built-in Vari-Flo Valve allows your child to control the liquid flow rate Dishwasher safe (top rack only) 6 Months + The unique one-piece valve promotes natural healthy drinking because it needs very little suction, allowing your child’s palate and teeth to grow naturally. Plus, they're BPA Free.