The multi-port system consists of a GLS 80 screw cap with four ports. The tubes are fed through the ports and secured with inserts and screw connections (all purchased separately). There is a choice of 5 inserts, each with different internal diameter depending on the application. Unused ports can be fitted with a blanking cap, if necessary. Sterile pressure compensation can be achieved using the membrane filter set (0.2µm pore size).