and you can rent them at most good rental places. You wrap the chain around the cast iron pipe, connect it to the other side of the handle and tighten. The cast iron pipe will snap at the site of the chain.
Before you do this, however, make very sure you have supported the pipe above and and below where you are breaking into it with the appropriate bracing (they make cast iron pipe bracing just for this task). Cast iron pipe is VERY heavy and you don't want your entire 1st and 2nd floor soil stack falling and clonking you on the head!