Abstract: A line coupler (10) for securing a trailer line (9) to an intermediate section of a diver line (5) with minimal chafing of the lines (5, 9). The line coupler (10) includes a shield (13) that has a cylindrical body (28), and a head (26) and a lip (30) formed at opposite ends of the body (28), so that a channel is formed on the body (28) between the head (26) and lip (30). The shield (13) is slid onto the diver line (5) and butt against a knot (20) on the diver line (5). The top (24) of the head (26) is preferably contoured to mate with the underside of the knot (20). The line coupler (10) preferably includes an annular grommet (22) that is forcibly snapped over the lip (30) onto the body (28). The trailer line (9) is wrapped around the grommet (22) and held in place by a splice (34). The grommet (22) rotates freely with respect to the shield (13), so that the trailer line (9) can rotate around the diver line (5) without chafing.