A coupling for joining fluid conduits includes a nut portion having a circumferential groove that extends at least partially along an interior surface thereof. The nut portion further includes a tab opening extending therethrough. A cylindrical shaft portion extends from the nut portion. A retaining clip is disposed within the circumferential groove of the nut portion and includes a tab disposed within the tab opening. A first arc of the retaining clip extends from the tab in a first circumferential direction, and a second arc of the retaining clip extends from the tab in a second, opposing circumferential direction. The first arc includes a first knob and terminates in a second knob, and the second arc includes a third knob and terminates in a fourth knob. The second and fourth knobs are larger than the first and third knobs, respectively.