A duct assembly including a first duct and a second duct that are connected by a receptacle and a fitting that are moved in a transverse direction to assemble the first duct to the second duct. The receptacle defines a slot that includes an inner wall and an outer wall. The inner and outer wall define a fitting insertion opening on one lateral side and a fitting seat on the opposite lateral side. A seal is provided on a face wall of the fitting. Triangular side walls extend between the inner and outer walls. A locking tab on a triangular side wall is received within a tab receiver on the outer wall of the fitting.