30AM-Locking/15AF:12-inch adapter cord with a threaded locking ring that creates a weatherproof connection on the 30 amp male side. The durable STW cord is used to convert a 30-amp marine type connection to a 15-amp standard receptacle. Use this adaptor to plug in common tools, radio, lights, blender, etc. to a marine type power pedestal. Rated for 125 volt.