Newbie to the forum w/a problem
In the plumbing section of the store---you will find a black rubber 'doughnut; a hub coupling---that is used to seal a PVC pipe properly into the cast iron hub---
Slip the PVC into the doughnut---then slide the pipe/coupling against the hub---pound the rubber into the hub with a hammer and a block of wood.
Mark the pipe/ doughnut joint with a marker---some times the PVC will slip out as you beat the doughnut into the hub---the mark will tell you if it's slipping so you can drive the PVC back in before it slips out to far.
New members: Adding your location to your profile helps in many ways.--M--