Mine doesn't have one. I was going to do the same thing as Ted, but instead I just removed the heater hose conection and screwed it in there. I really don't need a heater here in south Texas. If I ever have to have a heater for any reason then I will put it in the same place as Ted. I would have just put it there but trying to find a 3/4" tap proved to be a challenge. Thanks for the help.