حلقات O من Viton FKM | AS568-178 | داش 178 | صلابة 75 | بني (10 / عبوة)

Used these for a hydraulic fitting on a hot line that sees around 300°F, and they haven’t cracked or softened in three months of daily use. The -15°F lower limit gives me confidence for winter startups too. Pack of ten is a solid value for the price.

The 75 durometer stiffness is just right for my application, and the brown color makes them easy to spot during assembly. I've torqued these down repeatedly and they don't deform or crack, even at the 400°F end of their range.

Finally found o-rings that actually hold up in my engine bay without cracking after a few heat cycles. The 75 durometer feels just right for the fuel line connections I needed to replace.