One of my headlight washers seems to dribble a little on startup - there's a tell-tale dribble of water down the bumper most days. Looking on RealOEM, I can't see any check valves that are separate from the nozzle on any of the front washer systems but I see there is a valve on the rear washer line, just before the rear nozzle. Hmmm...

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)