Leviton Weatherproof Socket, Black R60-00055-000 - The Home Depot
National Artcraft Lamp Making Kit With 12"H Offset Lamp Pipe, Harp, Cord And Socket Has All The Parts For Creating A New Lamp Or Repairing An Old One. - Walmart.com
Iron Pipe Lamp Socket That fits 1/2 inch Iron Pipe (NPT) - - Amazon.com