I need to install a new flange on a lead pipe. The pipe has an immediate elbow under the floor so I cannot use the flange with a neophren gasket designed for this purpose, since its extra length would partially block the pipe. It appears my only choice is to use a standard, shorter plastic flange with some kind of sealant between the flange and pipe rim. Any suggestions about the best type of sealant for this? Silicon? Plumbers putty?
Or is there a better solution?
Or is there a better solution?