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O-Ring BR Backup Ring (Polytetrafluoroethylene Resin) JIS-B-2407 | MUSASHI OILSEAL | MISUMI South East Asia
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Military Standard MS28774 Teflon (PTFE) Back-up Rings | Seal & Design, Inc
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ST230 Single Turn Split PTFE Back-Up Ring [ST230] : The O-Ring Store LLC, We make getting O-Rings easy!
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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
What are Back-up Rings/Anti Extrusion Rings Guide - Barnwell : Barnwell