Abstract: A fish hook or line coupling device having a “valley crook” attachment feature for catching a knot of a fishing line and circumventing the hassle of stringing a fish line through the eye of a conventional fish hook and tying a fishing knot. The “valley crook” attachment includes a stem extending from the shaft of a fish hook or coupler to a bend providing a gap between the stem and a tail. The gap has a width less than a diameter of a knot in a fishing line. The tail may have an inward bend for catching the line within the gap, and the tail may be outwardly flared to facilitate installation of the line into the gap.