An O-ring is a torus, or doughnut-shaped ring, generally molded from an elastomer, although O-rings are also made from PTFE and other materials.
Flat O-Ring Manufacturers
O-Ring Sizes And Dimensions • Seal & Design, Inc
How to Recognize the Common Causes of O-ring Failure? - IRA
O-FLEX™ Metal Seal O-Rings - Technetics Group
O-ring - Wikipedia
How Does an O-Ring Work? Allied Metrics O-Rings & Seals, Inc.
8 Types of O-Ring + Applications (Clear Guide)
What is an O Ring - Selection, Material and Storage : Barnwell
What is a Hydraulic O-Ring and How are They Used?
Parker O-Ring Handbook ORD PDF Free Download