The PRODURAN® straight valves have a height-adjustable spindle with a fine thread, which allows the finest adjustment of the valve opening. The PRODURAN® valve tap from DWK Life Sciences is suitable for high vacuum in combination with the thick-walled attachments. The composite system made of DURAN® glass, metal and plastics means that the media flowing through the valve only come into contact with DURAN® glass and PTFE, allowing grease-free operation. The construction of the valve makes it handy, easy to release and dismantle. The unscrewing protection prevents absolute unscrewing of the valve pin. The adjustable valve pin increases the service life of the valve tap.