I had a couple of these made up, it allows for a plug and play install of an oil catch can as referenced in the DIY thread below. Adapter fits into the OEM Oil Burner connector retaining the use of it's o-ring seal and 4 clips, then allows you to connect a 3/4" hose w/ a clamp.
Where you would install this
I have 1 of the OEM oil burner adapters and 2 of the custom peices
$65 shipped for 1 custom w/ 1 OEM SOLD
$45 shipped for 1 custom