Torque converters

thanks for getting back so soon it is a factory coverter that is in my 72 340 duster that I bought from some one else that was already built I have no idea what year the engine or the trans are.My other 72 Duster 340 that has all the original parts has a drain on the converter the factory manual for 72 shows a drain also.just wondering what year did they not put plugs on