I think it is a 17 mm socket. If that is not right then try another size. I can assure you that is is a metric size.
It is on the rear of the engine block above the drain plug.
The 2001 Honda Accord has 16 valves.
The 2001 Honda Accord has a 5-speed manual.
The 2001 Honda Accord is a gas-powered vehicle.
The 2001 Honda Accord has an inline 4 engine.
The 2001 Honda Accord is 15 ft. 9.4 in. (189.4 in.) long.
The height of the 2001 Honda Accord is 4 ft. 8.9 in. (56.9 in.).
The 2001 Honda Accord has single overhead cam (SOHC).
The 2001 Honda Accord's turning circle is 36.4 ft..
The 2001 Honda Accord runs on regular unleaded.
Leaking windshield or clogged windshield cowl drain lines.
The 2001 Honda Accord has 42.1 in. of front leg room.