Step 5 · Measure and Cut the PVC Replacement Pipe

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

First, test-fit the shielded flexible couplings by sliding them onto each of the prepared cast iron ends. Don't tighten them yet. Now, measure the exact distance between the internal pipe stops inside the two opposing couplings. This measurement is the precise length your new PVC pipe needs to be. Transfer this measurement to your new piece of Schedule 40 PVC pipe and mark it. Use a PVC pipe cutter, handsaw, or miter saw to make a clean, square cut. After cutting, use a deburring tool or a simple utility knife to shave off any plastic burrs from the inside and outside edges of the cut.