10pcs http://www.ecigbestsave.com/Joye-eGo-T-Kit-p/joye tank.htm Joye eGo-T Overflow prevention caps for the Joye eGo-T tank cartridges. Available in Type A & B. This cap replaces the end cap of the eGo-T cartridge and is made of softer material for a better seals around the wick tube to help prevent leakage of e juice and better feed into the wick to help produce more vapor.