Good Choice
Posted by e-plumber on April 07, 2004 at 18:18:12:
In response to Good Choice
: : I'm replacing a 16" cast iron riser to a toilet with abs. I'm told it's OK to use okum with mortar in the old cast iron hub.

: Nevermind, the point is moot anyway. The city finally called me back, and they don't allow any plastic in a CI hub. I hate to do it, but I've called a plumber. I'd love to pour my own lead, but I don't relish the thought of teaching myself how to do it and possibly exploding a pot of hot lead.

: Thanks for the help anyway.

Good choice in your decision and thanks for posting back.
Another option came to thought, insert a push gasket (Tyler seal) into the hub and use the ABS or PVC, if permitted.
Good Luck. e-plumber

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