Straight out the back. If it drains into the bilge you're relying on a pump thats probably gonna be clogged with all that grime. Use Raybud or Seachoice ball scuppers on the drain tubes.
Ditto
Lloyd
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1973 Seacraft 20' SF "Sea Dog"
1988 Tracker/Seacraft 23' WA "Salty Dog"