Air valve, V2.0, UNF1/4'' 28G, service life 6 months, quantity = 100 pieces The SCAT air valves for SCAT Safety Caps prevent the absorption of impurities from the ambient air and prevent contamination of the solvents. Each air valve is equipped with a time indicator that shows the recommended replacement time after 6 months. The SCAT air valves against solvent contamination on HPLC systems offer numerous advantages: - Air valve for analytical and preparative use - With PTFE filter For clean solvent supply - Integrated valve diaphragm blocks solvent vapours