Mid Size Sealed ContainersAll SteriTite container systems include covers with integrated filtration systems and silicone gaskets. Solid bottom containers are compatible with pre-vacuum sterilizers. Perforated bottom sealed containers are universal and have filtration systems in their base, cleared for all current sterilization modalities such as gravity displacement, pre-vacuum steam, V-Pro and STERRADSterilization. Use with the respective basket or tray system. UNIVERSAL:-Perforated Bottom with 3 filter retention plates