I need some help guys. I'm going to be installing a dishwasher standpipe in a sink base cabinet. There will be a 2" riser comming up into the cabinet from the basement that will service a double bowl kitchen sink and the dishwasher standpipe. I'll tee off the riser for the standpipe below the tee for the sink. venting will be achived by an AAV.
My question is two-fold.
1)can I down-size the diswasher trap and standpipe to 1.5"?
2)can I use slip-joint fittings for the dishwasher stanpipe and trap?