lmanwarren
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I made my bathroom bigger and will be relocating all fixtures.I picked up a 1.6 gpf toilet and would like to know is 3 inch pvc big enough for the main line to the sewer.Would 3 inch have a benefit over 4 inch.See originally I planned on 4 inch but was told by a friend that 3 is plenty big enough.Now I did pick up a closet flange for 4 inch and outside where the pipe goes in it measures 5 inch to accept the 4 inch pipe figuring the pipe is 4 1/2 outside.Now I already cut my 5 inch hole to place the flange in so that it rest on the floor.Now if I took it back and picked up a flange for 3 inch pipe would the the screw holes for screwing to the floor be far enough apart so that it would fall outside my 5 inch hole.Wondering if I'm stuck using the 4 or if 3 would still be able to screw down.Other then a small amount of cash I might save would I be better off with 3 inch.Also the orginal cast pipe appears to be 4 inch inside.I will be cutting this out and using a fernco fitting to join the two.Do they make one to go from 3 to 4 inch. Sorry so long