Editor Reviews:

Product Description:
SipEase valves make Playtex Spill-Proof Cups spill-proof. They're designed to dispense liquid only when your child is sipping. Replace worn or lost valves with this refill pack. Features One-piece valve is activated when child sips Easy-to-clean Fits all Playtex Spill-Proof Cups 2 per Package

Rating : - Good item!
These replacement valves are great to have. However, you can find them at your local grocery store instead of paying the shipping charge. After I purchased this product I found out that I could have picked them up at the market. Ordering online just saves on the gas! Good product though.