I'm not where I can look at the plug right now, but I think it's either this: http://www.hubbellnet.com/max_htm/tech_stuff/NEMA/l2_20p.htm or this: http://www.hubbellnet.com/max_htm/tech_stuff/NEMA/l1_15p.htm You won't find them at the big box stores, but you should be able to get (or order if necessary) either one through a good local electrical supply jobber.