T
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
if its fitted properly waste cant get in the machine its all about keeping the pipe up high as possible and running down to the trapOr put a proper separate waste system in for the washing machine. Sorry but dislike multifunction sink waste systems,; they are nothing but trouble. Had to many customer complaining about food waste from the sink blocking the washing machine sump.
Reply to the thread, titled "Trying to find waste water connection...help?" which is posted in Bathroom Advice on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.