Answer to: How do you changeSee Breville Dual Boiler (BES900/BES900XL) Group Head Collar Insert Replacement Guide
Answer to: Why is my steam wand leakingMine is leaking water rather than steam. But maybe a water leak comes from the same root cause? I determined that the plastic handle has worn and the steam control lever now moves beyond the valve's fully closed position to a position which is partially open. So if you back up the lever a few degrees it might stop the flow. I have yet to figure out if there is a way to replace the plastic lever/handle piece.