look near the control box - there is a molded hose that clips into the false bulkhead and then into the valve, (right by the expansion tank)

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

On the passenger side the 2 hoses from the duo-valve connect to the heater core pipes underneath the water collector. It needs to be removed for access to the clamps - or remove the duo-valves and flush from the driver's side.