Hi, I've not posted for a while, not a plumber, but a keen DIYer who likes to try and do things without bodging if I can. Basically I'm wanting to create a cloakroom toilet in our utility room, theres already hot and cold feed so thats one job made slightly easier, thankfully. The problem I'm having is where to run the soil pipe for the toilet. I can run the pipe through the outside wall, I'm just wondering (hoping) if I can run it into this (see pics) which originally had the washing machine going into it. I foolishly had it filled in but have dug it all back out today. The guys who filled it in appear to have fit a kind of bung, obviously to stop the pipe getting blocked. Is this a standard thing to do? Can I simply unscrew it and fit a new pipe in? I've tried getting my tape measure in to get the size, think internally its about 140mm?? Will I need a reducer or is that soil pipe size? I also may have to come out of the wall, then go slightly left, (with a slight fall of course) then down vertically, then down on an angle to the existing fitting, will that be okay? Hope this makes sense, and hope the pics do to, thanks in advance for any advice.