Viton O-Ring Kit. HERCULES FLUOROCARBON (VITON) O-RING KIT

Viton, also called fluorocarbon, is the only material in this kit. Hercules built it around that one compound specifically because of how well fluorocarbon holds up against oils, fuels, and hydraulic fluids that would break down a standard nitrile ring pretty quick. The 568 FC KIT designation is Hercules Sealing Products' assortment kit format, so you're getting a range of sizes rather than a single ring, which makes it handy when you're tracking down a worn seal and aren't sure of the exact size off the top of your head.