O-Rings Explained: How They Seal, Materials & Why They Fail

Ever wonder what that tiny black rubber ring actually does? In this video we explain O-rings in simple terms anyone can understand — how they work, the difference between O-rings and flat gaskets, static vs dynamic sealing, the most common materials and colors, and the biggest mistakes that cause leaks. You’ll see exactly where they show up in your house, car, and everyday machines, plus what to do when one fails. 00:00 Intro 00:29 What is O-ring? 00:50 Applications 01:26 O-ring vs gasket 02:06 How O-ring works 02:38 Static vs Dynamic 03:06 Dimensions 03:20 Materials 04:10 Common errors