A seal using a seal body (1) which is subdivided in a latticework-like fashion into tensile struts (6) and compressive struts (7), forming cavities (8), and has an introduction portion (4) and can thus be used as a primary seal. The seal body (1) can be part of a seal arrangement (55) which includes a test and/or post-sealing space (56, 56a). In the case of pipe runs, an inner access line (60) or an outer access line (70) can be provided in order to test the sealing integrity of the seal and possibly to effect a post-sealing operation for leak-remedy purposes.
A double ring seal of unitary construction is made from a resilient deformable material. The ring seal comprises two coplanar sealing rings for use in sealing between two substantially planar surfaces, and means interconnecting the rings, such that an interspace volume is formed between the rings when the seal is in use.
