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The most common standard size of bubble caps used in industrial operation is___________________?

The most common standard size of bubble caps used in industrial operation is___________________?

A. 1″ dia cap with 0.5″ dia riser
B. 6″ dia cap with 4″ dia riser
C. 8″ dia cap with 1″ dia riser
D. 4″ dia cap with 8″ dia riser