8. Parbak - Back up rings - O-Rings-Stock O-Ring Webshop
Backup Rings (BUR) | Plastics Injection Molding | CTG Inc.
Plastic Backup Ring Sizes - Kalsi Engineering, Inc.
PEEK Back-Up Rings - M&P Flange & Pipe Protection
Case Study: Benefits of a Contoured Back-Up Ring | Marco Rubber and Plastics
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