Hi, I'm working on a project which includes a GM fuel injection system that was put on a Lotus in the late 80s... anyone familiar with this fitting on the fuel rail, and if it can be rebuilt/removed without damage? Any idea what the connection is?

It looks like a 19mm fitting of some kind for the return..I'm trying to convert this over to something a bit more advanced than a made-up L shape hard pipe that goes to a rubber hose, as it was when I got the car..
gm-efi1.JPGgm-efi2.JPG
Any ideas are appreciated - thanks!

Pete