Convenient complete system for the transfer of liquid media. Consists of 4-port screw cap (PP), four screw connections (black, M8 thread), silicone seals and DURAN® Pressure Plus bottle. The bottle is pressure-resistant in the range from -1 to +1.5 bar (TÜV-certified with GS-sticker). The cap has 4 connections, so-called ports. Outer tube diameters of 1.6, 3.0, 3.2 mm can be used. An optional pressure compensation via a sterile membrane filter (0.2 µm) is possible. Unused ports can be sealed with silicone blanking seals. The cap is completely autoclavable. Tmax = 140°C. The system is suitable for application in the field of HPLC or bio-technology and each process which requires a media transfer.