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O-ring Material Selection Guide : Orings-Online, Your only source for O- rings!
O-ring - Wikipedia
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Demaisi Color Brillian NBR Rubber O Ring for Your Selection - China Hydraulic Seal, Auto Parts | Made-in-China.com
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O-Ring, 264.5 mm (ID) x 8.4 mm (T), Q = 1 Pkg (1 O-Ring(s)), ORG1-R-P2 – TransPacificSupply.com
CS 7mm Black O-Ring Seal ID 16mm-700mm Car Nitrile Rubber O-Rings Spacer Oil Resistance Sealing Disc ID 30mm AD 44mm Black CS 7mm : Amazon.de: DIY & Tools
Metric Size NBR Buna Nitrile Black 70 Shore a Box Specification Orkit-5A 386 PCS Rubber Seal Kit O Ring Kit - China O Ring Kit, Repair Kit | Made-in-China.com