I've got a 4" cast iron waste line with a slab floor. The pipe is 2 1/4" below the floor surface. The replacement flanges I have found are only 3" long. Is this 3/4" enough for a good seal? Does anyone know if there are longer replacement flanges out there? Thanks

Try the one with three allen screws in the top. Screw it to the floor also.

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Originally Posted by MWSwift

I've got a 4" cast iron waste line with a slab floor. The pipe is 2 1/4" below the floor surface. The replacement flanges I have found are only 3" long. Is this 3/4" enough for a good seal? Does anyone know if there are longer replacement flanges out there? Thanks

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I would like to see a little more depth to work with but I can yearn, pour and caulk a lead and oakum joint in 3/4" depth. They do make a 4" deep 4" cast iron flange but you have tom search for them. Would you want me to look?
Regards, Tom

Doug, are you describing the Oatey Twist-N-Set, it has 3 screws that expand a neopreme collar.

I am describing the compression seal that has 3 allen screws on the top of the flange.