I haven't used cpvc for a long time and don't remember if the sizes match up wotj pvc so you can connect them. Browsed the web for a few minutes and didn't find any answers. So if a 4" cpvc ball valve dropped on me from out of the sky, can I glue it to 4" pvc? If the diameters matchup, I'm assuming there would be a glue for the job, similar to what you get for pvc to abs.