Abstract: A coupling device for attaching a protruding tendon disposed in a concrete structure to an extension strand comprises a barrel having a first end and a second end, a first conical bore disposed adjacent the first end having a first pair of wedges and sized to receive and grip the protruding tendon, a second conical bore disposed adjacent the second end and having a second pair of wedges and sized to receive and grip the extension strand, and a release bushing adapted for placement adjacent the first end of the barrel and having an aperture sized to receive the protruding tendon. The release bushing includes a contact surface positioned to contact the first pair of wedges and arranged to shift the first pair of wedges to a disengaged position in response to shifting the first end of the barrel toward the release bushing.