It varies by model and year. Ours goes direct to the dump pipe. Here's how you can tell if yours does the same.
If yours dumps directly to the dump line, underneath the rig you will see a pipe coming out from directly under the washer compartment and connecting to the main dump pipe. At least, on our 2007 3400 this is how it is.
Otherwise, you could dump all tanks, leaving the valves open. Run the washer until it drains. Note the flow of water out of the dump pipe (requires a clear connector). Close one tank at a time until the flow stops. Then you know which tank it drains into.
Good luck.
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