How do I connect 4in PVC drain pipe to a 4in cast hub ? I was told to use lead but dosen't lead melt at around 700deg. Won't that melt the PVC ? The NO-HUBs are a no-go that's from the inspector.

You can stuff a wet towel into your caulk adaptor that you will need to get from a plumbing supply house not a hardware store and that will usually keep the hot lead from melting the PVC adaptor it may look a little out of shape inside the adaptor when you are finished but it shouldn't affect your inspection I hope this was helpful

Jim gave you instructions for pouring a horizontal lead and oakum joint. I guess "caulk adapters" came along after I retired because I have no idea what they are. When we poured a lead joint between a cast iron hub and a piece of PVC we poured cold water on the hub and hoped like hell that we were quick enough to cool it down before it ate into the PVC.
Let me give you a way to connect that PVC pipe that won't get you in trouble with the inspector. Purchase a 4" Duel-Tite neoprene gasket and insert it in the hub. Now take a file and bevel the edge of the PVC so that no sharp edges hang up in the gasket. At the same time you pick up the gasket purchase a small can of Duel-Tite Lubricant to grease the end of the PVC pipe so it will slip into the gasket. If you have trouble getting it started it's acceptable to trim back a few of the ridges on the gasket so the PVC will enter and you can shove it home to seat. This will get you a water tight conversion from cast iron to PVC. Regards, Tom

Well i talked to the inspector. He told me that i had to lead it in or snap the hub off the cast pieice coming out of the floor and use a mission band. My cast hub is 6in from the floor and the pipe curves so i'm not going to try to cut that off. i'm sure nothing good can come of that. I have found a pvc hub adapter that says it can be hot leaded.so we will see what happens.if you have any other ideas or know of any other products please let me know.thanks

Your inspector must have been "old school" if he insisted on a poured joint.
Do you need instructions on how to yarn, pour and caulk a horizontal joint?
If so just ask. Good luck, Tom