a-collection AVI 1671 Check Valve socket/socket 1.4408/316/PTFE. Check valves with threads (Technique / Industrial valves / Check valves). Principal data: thread 1 3/4", thread 2 3/4", pressure pn 40 bar. Supplied under manufacturer part number 4950596, EAN 7350027278993, HS code 8481.30, country of origin Switzerland.