School plumbing repair. Pull old toilet and found offset closet collar under toilet. I believe old toilet is a 12” rough. They only make 10” rough toilets for Sloan flush valve today. So I replaced closet collar and set the toilet. Sloan valve is off. I angled it to make work. To correct this I had to shut off water and replace a galvanized nipple coming out of the wall replaced with longer size. Toilet is working and not leaking as of this date.