I made my bathroom bigger and will be relocating the bath and toilet and sink.I bought a new 1.6 gpf toilet and wondering is 3 inch big enough for the main line that runs to the septic.I made the hole for the flange 5 inch being I planned on 4 inch pvc and the flange is 5 inch outside.I was told by a friend 3 inch is plenty big enough.Now if I bought a flange for 3 inch would it be big enough to go out past my 5 inch hole on the floor surronding it so that I can screw it to the floor or am I stuck using 4 inch now.Now the original cast iron pipe looks to be 4 inch inside and using a fernco fitting would it be fine to go from say 3 inch pvc to the cast or does it have to be the same size for the fitting to seal ok.
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