Good working draft fan with motor, impeller fan, pressure + thermal sensors, and wiring and electrical connector.
Removed from a Bradford White 50 gallon gas-fired unit - may fit others. Mounts on top of the water heater over the flue. 2" exhaust outlet fits standard PVC pipe fittings.
Two available, $25 each, both for $40. Other working parts also available (gas control, electronics, burner, etc.).