Here's a drill bit that should accomplish what Johnboy555 describes.
http://www.pascospecialty.com/catalog/PASCO_CATALOG_C.pdf
http://www.pascospecialty.com/catalog/PASCO_CATALOG_C.pdf
They make a tool now that is designed to drill out the pipe from a cemented joint. I'm pretty sure it's called a "Hub Saver" but go in to any plumbing supply house, not the big box stores, and they should have one. I've used it and it's saved me a lot of time and work. Cut the vertical pipe about 2' above the crack, and directly above the hub of the fitting. Use the Hub Saver as directed...make sure to hold the drill in a VERY straight line to the hub. Glue a new 2" piece of pipe into the hub and install a using a Fernco or repair union (connector) at the top.
Seems like replacing this assembly isn't that much harder or more expensive than using one of these couplings, and it is a nice, relatively simple, first project since it's just replacing what's already there. Replacing the assembly would also possibly give the OP the chance to convert that existing s-trap into a p-trap-- that's a bigger siphon concern to me than the (future) a/c trap.
Enter your email address to join: