Never go down on equipment with an extra silicone valve for your WOW cup.Does your WOW cup need a replacement, or do you just want to be able to mix and match colors? This silicone valve is a spare part for your WOW cup, and fits all except the \"mini\" cups. The valve is essential for the cup\'s unique spill-proof function and works just as well as the original valve that came with the cup.Product info:Spare partProvides spill-proof functionFree of BPA, Phthalates and PVCSoft silicone