I put a quick disconnect on my YM2002 on one of my auxilairy outlets by taking out the existing plug, drilling and tapping it for 1/8" pipe thread. My fitting was metric. I believe the US sold Yanmars have inch sizes which are more available. I do know flow is not a problem with what I did. What are you wanting on the other end of your adapter? Would this work? Adapter, SAE to JIC, 90 Deg Elbow - Hydraulic Hose Adapters and Plugs - Hydraulic Hoses - Hydraulics : Grainger Industrial Supply