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Question:

What does the 6 11/4 mark on the flange face mean?

What does the 6 11/4 mark on the flange face mean?

Answer:

6 inches, 1 right, 4 inches, 3 inches, 2 inches, 1, 2 inches of right.
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
This is the American Standard. "6" means "DN150 11/4", which refers to "DN32", "11/2", "DN40", "" and "DN80"

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