Timing cover crank seal reinstallation tips?

I needed to install a seal. What I did was brought the seal to a flea market and found the right size PVC coupling to install it. It isn't your ordinary PVC size, it's gray in color and measures 23/8 on the inside and 3" on the outside. It fits many seals that we encounter. I tried on a SB timing cover seal and it will do the job.