Devices, systems, and methods for connecting concrete structural elements

A duct coupler system, the system comprising:

• a duct coupler comprising:
• a tubular coupler body having a body central axis, a first end, a second end axially spaced apart from the first end, and a wall extending between the first end and the second end, wherein the first end faces a first axial direction and the second end faces a second axial direction,
• a first arm and a second arm, each arm having a fixed end and a free end, wherein the fixed end is coupled to the second end and extends axially therefrom, and the free end is axially spaced apart from the fixed end, wherein each of the free ends are resiliently urgeable in a radial direction, and
• a first tooth and a second tooth, the first tooth being coupled to and extending radially from the first arm and the second tooth being coupled to and extending radially from the second arm;
• and
• a duct adapter comprising:
• a tubular adapter body having an adapter central axis, a coupler engagement portion, and a duct engagement portion axially spaced apart from the coupler engagement portion, and an adapter wall, wherein the adapter wall has an inner surface, wherein the inner surface of the adapter wall of the coupler engagement portion defines one or more grooves, wherein the duct engagement portion is configured to be coupled to an end of a duct,
• wherein the first tooth is shaped such that, in a first configuration where the first tooth is engaged with the one or more grooves of the adapter wall, the first tooth allows the duct coupler to move in the first axial direction with less axial force than moving the duct coupler in the second axial direction,
• wherein the second tooth is shaped such that, in a second configuration where the second tooth is engaged with the one or more grooves of the adapter wall, the second tooth allows the duct coupler to move in the first axial direction with less axial force than moving the duct coupler in the second axial direction, and
• wherein the first tooth and the second tooth do not simultaneously engage the one or more grooves of the adapter wall.