Sippy cup without a valve
June 20, 2016 7:51 AM Subscribe
We have a sippy cup that operates without the internal addition of a valve. Instead it seems to have a rubber gasket built into the sippy portion that keeps water from spilling until suction is applied. It is unbranded. Can anyone point me to sippy cups that are two pieces (cap and cup), rather than three (cap, valve and cup)?