Where is the oil drain plug on a craftsman snow blower 9 hp model 536.887990?

Look at the snow thrower as if you were walking behind it. About an inch or two above and to the left of where the drive speed control arm goes into the engine, there is a 3 inch pipe that comes out of the engine. On the end of that pipe is the drain plug. Make sure to tip the entire snow thrower back a bit at the end of emptying to get all the oil out.