Broke pipe. Now what?

So, you can probably see what's happened here. The 4" pipe is my main vent stack. The broke fitting goes to a 2" washing machine drain pipe.

My thoughts were to cut the 4" fitting out altogether and replace with an identical fitting, and join it all together with rubber boots. I'd probably have to attach short lengths of 4" pipe to the top and bottom of the new fitting for something for the boot to attach to, and maybe use a pvc coupling where I can.

(the black wrap on the existing pipe is just for sound dampening, in case you're wondering)

I'm not a plumber but I see no reason why this wouldn't be ok, but I'm wondering . . . is it ok by code to use rubber boots on the main vent stack?

Any help would be appreciated.

Thanks!

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Broke pipe. Now what?