Replace standard caps with these pumps. Body molded of 100% polypropylene for maximum chemical resistance. FDA and USDA approved for food applications. Dispenses 1-oz per stroke. One gallon pumphas a 10-3/4" dip tube and is 14-3/4" long overall. Five gallon pail pump has a 14-3/4" dip tube and is 21-3/4" long overall.