18-0043-06 
5-Pack of FKM Viton O-rings for 6AN ORB (9/16-18 threaded) fittings 
18-0043-08 
5-Pack of FKM Viton O-rings for 8AN ORB (3/4-16 threaded) fittings 
18-0043-10
5-Pack of FKM Viton O-rings for 10AN ORB (7/8-14 threaded) fittings
18-0043 
15-Pack of FKM Viton O-rings for 6AN, 8AN, and 10AN ORB fittings (5ea)