50mm ID x 56mm OD x 3mm thick O-ring. Buna-70. Quan 1. | eBay
Tial 50mm Blow Off Valve sealing O-Ring – Go Fast Bike Parts
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4 Pcs Black 50mm External Diameter Rubber O-Ring Oil Seal Sealing Ring - Walmart.com
Silver Metal O Ring 50mm More Size Multi-purpose Silver Metal O Ring Metal Rings For Bags Ring Purse Webbing Diy Accessories - Buckles & Hooks - AliExpress