Abstract: A joint for coupling corrugated or ribbed pipe segments, including helical ribbed pipe segments, end-to-end includes a segment of corrugated or ribbed pipe having a plurality of corrugations or ribs spaced axially along the segment's outer surface, a spigot portion at an end of the segment where the corrugations or ribs have been partially removed to form annular bosses, an annular gasket positioned in the spigot portion, and a cylindrical coupling positioned over the spigot portion and gasket. The outer diameter of the coupling is substantially equal to the outer diameter of the corrugations or ribs, and the inner diameter of the coupling is larger than the outer diameter of the bosses such that a gap is formed between the coupling and the spigot portion. The gasket is sized to have a radial thickness slightly larger than the gap such that the gasket forms an air-tight seal between the spigot portion and the coupling when the spigot portion and gasket are inserted into the coupling.

Abstract: A joint for coupling corrugated or ribbed pipe segments, including helical ribbed pipe segments, end-to-end includes a segment of corrugated or ribbed pipe having a plurality of corrugations or ribs spaced axially along the segment's outer surface, a spigot portion at an end of the segment where the corrugations or ribs have been partially removed to form annular bosses, an annular gasket positioned in the spigot portion, and a cylindrical coupling positioned over the spigot portion and gasket. The outer diameter of the coupling is substantially equal to the outer diameter of the corrugations or ribs, and the inner diameter of the coupling is larger than the outer diameter of the bosses such that a gap is formed between the coupling and the spigot portion. The gasket is sized to have a radial thickness slightly larger than the gap such that the gasket forms an air-tight seal between the spigot portion and the coupling when the spigot portion and gasket are inserted into the coupling.