Brand: Setrab Oil Coolers
This O-ring port adapter screws directly into your Setrab oil cooler (sold separately) to connect a 5/8" ID rubber hose without a separate hose end.  M22x1.5 threads are standard on Setrab oil coolers.*  The M22 end swivels so you can aim the barb in whatever direction you need. Includes O-ring.  Sold individually.   
* Note that the 6-series coolers (13" long / 11 1/8" without mounting tabs) are also made with male 16AN fittings instead of O-ring ports; be sure to check before ordering if you have a 6-series cooler.