Air valve, V2.0, UNF1/4'' 28G, service life 6 months, quantity = 8 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