Things You'll Need
Instructions
Examine the reducer carefully to decide which is the wider end and which the narrower.
Measure the width or diameter of the wider end. Write this down on a piece of paper, toward the left.
Measure the width of the narrower end. Write this down on the piece of paper, in the middle.
Write "to" in between the two figures. Write the word "reducer" after the second figure.
Read what you have written, for this is the name, or size, of the reducer, such as a "6 inches to 4 inches reducer."