Abstract: A coupling is disclosed made up of a female member and a male member adapted to fit together. The male member has an outer peripheral groove and the female member has fastening means including levers swingably connected to it. The levers can swing into alignment with the axis of the coupling to clamp the male member firmly against the seal in the female member. An improved arrangement is provided for holding the levers in place. The arrangement includes spring loaded detent balls in countersinks. The balls project out the side of ears next to the levers. The spring may be leaf springs overlying the detent balls, urging the detent balls into engagement with chamfered edges of the levers. The detent balls prevent the levers from inadvertently rotating to release the coupling due to vibration or ther reasons.