Polypropylene 8 oz. capacity dispensing unit. Priming Instructions The Grafco dispensing unit features one hand dispensing. This unit may require priming of the fluid prior to the first use and periodically throughout the lifetime of the unit. To prime the unit: 1. Ensure fluid is in the dispenser 2. Flip the unit upside down 3. Flip the unit to the upright position 4. Place the dispenser on a flat surface and press down on the white pump with the hinged cover swiveled laterally. Please note, it may take a few pumps before fluid is seen on the concave reservoir.