re: Wash machine drain backing up

If you go the fernco option. Once you prevent the stand pipe from overflowing the water has to go somewhere. Based on your description your blockage is down stream from the washer and kitchen sink. So you will probably get a few inches of water backing up in the kitchen sink when the washer drains. Keep an eye on your p trap and plumbing under the sink the first few times it happens.

I bought this pressure washer pipe jetter attachment from amazon that worked pretty good on 2' cast iron pipes. Cleans out the whole pipe instead of punching a hole like a drain snake.

Amazon