Abstract: A flange joint includes opposed companion flanges including opposed faces having central voids therein, and mutually engageable teeth. A pilot member is carried by one of the companion flanges in its central void and is arranged for insertion into the central void of the other of the companion flanges upon assembly of the companion flanges for preliminary axial and rotational alignment of the flanges before engagement of the mutually engageable teeth.

Abstract: A universal joint assembly has a housing and a universal joint in a chamber within the housing. A diaphragm seal in the housing forms a wall of the chamber. The chamber is substantially sealed to exclude entry of foreign elements. The diaphragm seal is flexible to allow for expansion and contraction of the chamber due to changes in temperature to prevent any substantial increase or decrease in the pressure within the chamber.