I've found fernco 1-1/2 (both sides) shielded coupling at Home Depot it's known as proflex will this suffice to attach cast waste pipe and cast vent pipe to PVC if it matters it's shield is made of 310 stainless.....the box was empty so I have to wait for the next shipment....
Technically, you need the coupling labled for cast iron on one side and plastic on the other. Although a "No-Hub" coupling will usually work, it may not always pass an inspection.
I'm pasting a link to the fernco proflex page but it doesn't tell you if it's hubless click on the models and assist me with what you think I should purchase the 3000-150 is what I think I need but it may be hubless
It's sort of like torquing the head back onto a car block...you don't want to tighten one up fully before snugging up the other(s). As long as you don't tighten one while the other is totally loose, it should work fine.