O-Rings are molded circular rings with a circular cross section, sealing is achieved by compressing the cross section in its housing. O-Rings are predominately used in non-moving (static) applications, However in certain conditions it may be possible to use O-rings in moving (dynamic) applications. O-Rings seal by mechanical deformation that creates a barrier to a fluids potential leak path between two closely mated surfaces, They are typically installed in a groove that's machined or molded in one of the surfaces to be sealed. We stock O-Rings in both metric and imperial sizes in a range of materials such as Nitrile, Viton, Silicone and EPDM. If there is anything you are unable to find, please do not hesitate to contact the sales team on 01202 746031