They create a seal. That's really it. They’re a simple rubber ring, typically, and they get squeezed between two surfaces to stop fluids – usually fuel, oil, or coolant – from leaking out. Think of it like a gasket, but smaller and more focused on a specific point. They come in different materials to handle different fluids and temperatures, so getting the right one is important. You'll find these all over, but specifically in the fuel supply system, they seal connections where the fuel line connects to the fuel rail, the fuel pump, or even the fuel tank. They’re also used in a lot of other engine parts too, wherever there’s a need to stop a leak. They’re kind of the unsung heroes, doing a small job, but a critical one. If one of these fails, you’ll notice if you have a fuel leak pretty quickly, usually by a fuel smell or seeing fuel pooling somewhere. That’s obviously a fire hazard, so it's something you want to address right away. Even a small leak can cause performance issues, like a rough idle or loss of power. They’re cheap to replace, but a major pain if they cause bigger problems down the line. A lot of times you can find exactly the one you need on a site like Fixparts Online – they have a pretty good selection. It’s always best to replace them when you're already working on that fuel system to prevent future headaches. Backed by experts: O-Ring (MPN 1280210748) includes a 12-month warranty!

About Bosch

With a heritage of innovation, Bosch provides dependable and efficient automotive components that set industry standards.

Why Choose Bosch?

• Bosch parts are known for being reliable and lasting a long time, saving you money in the long run. • They work well right out of the box, so you can get back on the road quickly and easily. • Bosch invests a lot in research and development, meaning they’re always improving their parts with the latest technology. • Whether you drive a newer car or an older one, Bosch has a wide range of parts to fit your vehicle. Bosch delivers excellence, FixParts Online delivers to your door.