Equivalent paper fractions to represent the measurements of "Gallon Man".
Use before construction of a Gallon Man for best information retention (in my experience). Show relationship between fractions as a whole and other fraction equivalence. Then, show the relationship to actual gallons, quarts, pints, and cups.
Print on different colored paper, cut out, label fractions (or use pre-labeled fractions for differentiation), and volume/measurement vocabulary.