Minn Kota Receptacle Adapters 12v Mkr18 . Universal design for 2- or 3-wire configuration 12 - 36 volt systems Watertight sealing cap corrosion-resistant plated brass electrical components Standard 1 18 diameter mounting hole Locks into receptacle to provide a watertight seal Ergonomic soft-contoured grip for easy hook-up Note The 6 gauge adapter MKR-18A is sold separately