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I was thinking of taking the sink into the existing boss and the bath to a new one. Not sure it’s a good idea to tee them into one and then into a new boss. Bath waste could cause some syphoning of the Sink waste. The boss is angled up at 2.5 degrees I think, so I guess waste entry has to be...

Hi all, new here. I’m having the back of my house rendered and want to tidy up the waste pipe work before and after. Currently both 1st floor sink and bathroom waste pipes go into a cast iron hopper and from there down to the gully in 2 1/2” caste iron? This is close enough to the new (ish)...