Amazon.com : APPLIAFIT O-Ring and Backup Ring Kit Compatible with Hayward SPX0735GA for Select Vari-Flo Valves 1-Pack (3 Pieces) : Patio, Lawn & Garden
Back-up ring - Anti-extrusion ring - FRANCE JOINT
O-Rings? O-yeah! How to Select, Design, and Install O-Ring Seals – Tarkka
Replacement O-ring & Backup Ring for Chambers - Bauer
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
Size 112 Virgin PTFE Industrial Back-Up Ring Solid
Backup Rings | Global O-Ring and Seal
Back-Up Rings | Anti-Extrusion Rings | American High Performance Seals