There are 32; 3, 11/2, and so on, please master pointing, by the way, such tagging is based on what standards.
This is the American Standard. "6" means "DN150 11/4", which refers to "DN32", "11/2", "DN40", "" and "DN80"
These refer to flanges,The 6 refers to DN150, 11/4 to DN32, 3 DN80, 2 DN50, 11/2 refers to the DN40 standard, American Standard so marked
6 inches, 1 right, 4 inches, 3 inches, 2 inches, 1, 2 inches of right.
