A seal ring comprising a circular ring body extending between a first end (830,930) and a second end (840,940) engageable with the first end, the circular ring body comprising an inner circumferential face; an outer circumferential face opposing the inner circumferential face having a first lateral edge and an opposed second lateral edge; a first lateral face extending between the inner circumferential face and the opposing outer circumferential face; and a second lateral face opposing the first lateral face, disposed between the inner circumferential face and the opposing outer circumferential face; wherein the first end includes a central region and two lateral regions, one on each lateral side of the central region, and the second end of the seal ring includes a central region and two lateral regions, one on each lateral side of the central region, such that when the first end is engaged with the second end to provide a circular ring seal, the central region of the first end is laterally aligned with the central region of the second rend; the first end includes a platform in a radially inward portion of each of the lateral regions thereof, and a vertically-extending blade in a radially outward portion of the central region thereof, the blade extending circumferentially beyond the platforms, forming an extension of the blade; and the second end including two vertically extending fingers in a radially outward portion of each lateral region thereof, and a platform in a radially inward portion of the central region thereof, the platform extending circumferentially beyond the base of the fingers and being accessible from a radial outward side of the central region of the second end; and wherein when the first end is engaged with the second end, at least a portion of the extension of the blade of the central region of the first end that extends beyond the platforms of the lateral regions of the first end is disposed radially directly over the platform of the central region of the second end, at least a portion of each of the fingers of the lateral regions of the second end is disposed radially directly over a platform of a lateral region of the first end, and the blade of the central region of the first end is disposed between the fingers of the lateral regions of the second end. an inner circumferential face; an outer circumferential face opposing the inner circumferential face having a first lateral edge and an opposed second lateral edge; a first lateral face extending between the inner circumferential face and the opposing outer circumferential face; and a second lateral face opposing the first lateral face, disposed between the inner circumferential face and the opposing outer circumferential face; wherein the first end includes a central region and two lateral regions, one on each lateral side of the central region, and the second end of the seal ring includes a central region and two lateral regions, one on each lateral side of the central region, such that when the first end is engaged with the second end to provide a circular ring seal, the central region of the first end is laterally aligned with the central region of the second rend; the first end includes a platform in a radially inward portion of each of the lateral regions thereof, and a vertically-extending blade in a radially outward portion of the central region thereof, the blade extending circumferentially beyond the platforms, forming an extension of the blade; and the second end including two vertically extending fingers in a radially outward portion of each lateral region thereof, and a platform in a radially inward portion of the central region thereof, the platform extending circumferentially beyond the base of the fingers and being accessible from a radial outward side of the central region of the second end; and wherein when the first end is engaged with the second end, at least a portion of the extension of the blade of the central region of the first end that extends beyond the platforms of the lateral regions of the first end is disposed radially directly over the platform of the central region of the second end, at least a portion of each of the fingers of the lateral regions of the second end is disposed radially directly over a platform of a lateral region of the first end, and the blade of the central region of the first end is disposed between the fingers of the lateral regions of the second end.