Global O-Ring and Seal on Twitter: "Requesting for backup? We have backup rings readily available in NBR, Viton, and Teflon (Solid, Split, and Spiral versions). Use our Backup Ring Size Chart here
Back Up Rings for O Rings | Specialist Sealing Products
Back-Up Rings :: JRoyal
Backup Rings | Global O-Ring and Seal
Back-up Ring | Aircraft MIL Grooves | Trelleborg
Size 337 Virgin PTFE Industrial Back-Up Ring Solid
Back-up ring - Anti-extrusion ring - FRANCE JOINT
ST230 Single Turn Split PTFE Back-Up Ring [ST230] : The O-Ring Store LLC, We make getting O-Rings easy!