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Valve settings

In the under-seat compartment with the Alde system, attached to the floor, is a yellow valve with a plumbing line that it regulates.

The valve appears to have 3 possible positions --:
1) all the way forward (away from me, flat/horizontal),
2) completely up (vertical),
3) all the way back (towards me, flat/horizontal).
Can anyone tell me what this valve controls, and what these three settings are for?

Thanks in advance.

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