Evaporust is getting rave reviews everywhere I turn. Local hot rodders and jeepers are swearing by it.
Since yours is an '07 Iron Barrel I assume it will have the same tap as my '06 which was supplied to R.E. by Karcoma of Germany. If it is, the name will be cast on the lever and it will look like this.
The sediment bowls threads are very fine and the bowls can be quite tight so use due caution when unscrewing to avoid damage.
The fuel taps in the tank stand pipe is a softer plastic affair with a filtering screen of its own. It is a friction press fit into the taps main body. Attempts at unscrewing only results in ruining them. ( do not ask me how I know this )
In the event a rebuild kits is ever needed they are available on the secondary market from various suppliers of BMW air head restoration parts