The present invention provides a gimbal expansion joint for use in joining ducting. The gimbal expansion joint has a first clevis adapted to be secured to one end of a first piece of ducting, a second clevis adapted to be secured to an end of a second piece of ducting, and a gimbal arrangement to which the first and second devises are pivotably connected to form a universal joint between the ends of the pieces of ducting. The joint further has a flexible duct extending between the first and second clevises to form a passage for fluid communication between the ends of the first and second pieces of ducting. The flexible duct has a respective flange at each end. Each flange provides an axially-directed face across which a clamping load is applied to affix the flange to a corresponding axially-directed face of the respective clevis.

A bellows restraint includes a first bracket having a first mount and a first arm extending from the first mount, a second bracket having a second mount and a second arm extending from the second mount to be adjacent to the first arm with the second arm having at least one through-hole, and a first fastener extending through the at least one through-hole of the second arm to connect to the first arm with the first fastener having a cross-sectional area that is smaller than a cross-sectional area of the at least one through-hole to allow the first bracket to move in relation to the second bracket.