Do I need to prep or paint this before installing?

The adapter comes ready to bolt on—no prep or finishing required. If you're running it in an engine bay where appearance matters, you can paint it to match your bay color, but it's fully functional out of the box.

Will this work with my existing drain hose, or do I need to buy new hose?

You'll need hose that matches 10 AN sizing. The fittings are pre-installed, so measure your existing hose diameter and source compatible 10 AN hose if needed. The adapter itself handles the flange-to-drain connection.

What fasteners do I need to bolt this to my pan?

Mounting bolts are not included—check your pan bolt pattern and engine service manual for the correct fastener size and torque spec. Most pan flanges use standard metric or SAE bolts; bring this adapter to the hardware store to verify pattern fit before ordering fasteners.