We designed this 5/8 ... 0.625" inch Hose Barb to 10AN adapter when we were converting all of our Power Steering Kits to 10AN on the Pump from the Reservoir. Some Power Steering Pumps, many BMW ones, don't have a removable adapter for the Feed Hose. The Push-On hose connection is cast into the Pump Housing. Luckily it does have a barb / bead roll / small swage at the end for a Viton O-Ring to sandwich against and create a reliable seal using this design.
This adapter is machined from 6061 Aluminum, bead blasted, Hard UV-Proof Anodized Signature Chase Bays Black, and lastly laser etched with Chase Bays logo and Part Number. The O-Ring is Viton for extreme chemical and heat resistance.