It's more of an automotive type fitting, but you might check local plumbing shops, if any of them do any oil heating system work. I have my doubts that HD or Lowes would carry them.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.