Abstract: A hollow fiber cartridge includes a stack of hollow fiber mats. The stack has a major axis and two end faces. Each mat is substantially perpendicular to the axis. An end cap is united to each end face.

Abstract: The instant invention is a hollow fiber membrane contactor, and method of making same. The hollow fiber membrane contactor includes (1) a shell, said shell having a internal bonding surface, an interlocking geometry ring being provided on said internal bonding surface; (2) a unitized structure; (3) a potting material joining said unitized structure to said shell at said interlocking geometry ring thereby forming an interlocking seal therebetween; and (4) end caps, said end caps being adjoined to lateral ends of said shell. The method of making a hollow fiber membrane contactor includes (1) providing a shell, said shell having a internal bonding surface; (2) providing an interlocking geometry ring on said internal bonding surface; (3) forming a unitized structure; (4) placing the unitized structure into said shell (5) potting said unitized structure to said shell at said interlocking geometry ring thereby forming an interlocking seal therebetween; and (6) adjoining end caps to lateral ends of said shell.