The 520040 Bronze Garboard Drain provides drainage for bilge during haul-out. These 1/2 NPT tapered thread plugs provide a watertight seal for the garboard drain. The plugs features a 2 diameter flange OD with three countersunk holes for #10 screws for installation. The plugs have a square top for use with a socket wrench. Includes 10 replacement plugs per package. Fasteners not included.