From the limited photo description it appears to be a John Guest or push to connect fitting. Very similar to a Sharkbite fitting. Search those options. There is a collet to push in and the tubing pulls out. I use a crescent wrench with the jaws spread slightly larger than the tube to push in the collet.
Yes the mighty little BMW 1800TI is leading the Shelby...The Porsche is lapping us both!