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. Shop with confidence: O-Ring (MPN A6269970345) comes with a 12-month warranty!

About Mercedes-Benz Passenger

Mercedes-Benz Passenger is a prestigious German brand known for its luxury vehicles that combine advanced technology with refined design. Originating from Germany, this brand represents the pinnacle of automotive sophistication and performance.

Why Choose Mercedes-Benz Passenger?

• Keep your Mercedes-Benz performing its best. Our parts are specifically designed and tested for your vehicle, ensuring a perfect fit and optimal performance. • Genuine Mercedes-Benz parts are built to last. They’re made with high-quality materials and rigorous standards, so you get long-lasting reliability. • Protect your vehicle’s value. Using genuine parts helps maintain your Mercedes-Benz’s resale value and overall condition. • Peace of mind. You can trust that Mercedes-Benz Passenger parts are backed by our commitment to quality and engineering excellence. Performance you can rely on – Mercedes-Benz Passenger parts from FixParts Online.