I've found a ton of information on how to properly plumb a utility tub in addition to an existing washing machine, but my question is this: can I remove the washing machine and plumb the new tub into the 2" standpipe the washer used to drain through? From what I have gleaned, I would not want to use a p-trap in addition to the trap on the standpipe, as double-trapping can cause problems. I'm thinking I could just run a 2" drain pipe from the tub to the standpipe and let the trap at the bottom of the standpipe do the trapping. Any input is greatly appreciated.