Edelmann 5/8" x 1/2" Compression Fitting Replaces Gates GB08100-1008 Part 168908
$25
EDELMANN 168908 Cross Reference Edelmann 168908. Part Number: 168908. They do not require flaring or soldering. To make a connection, place the nut and then the sleeve over the tubing, and insert the tube into the fitting body as far as possible.