Milton Industries Zeeline Piston and Grease Pumps come in several varieties, including the 3:1 air ratio, the 5:1 air ratio, the 45:1 air ratio, and the 70:1 air ratio. Each of the piston pumps come in several varietals, including standard and high flow rates as well as those meant for 55-gallon drums. Both the 3:1 and 5:1 pumps can handle fluids from medium to high viscosity for short to medium distance applications and feature a flow rate of 3.2-3.9 GPM (12-15 LPM) depending on the model. The 45:1 and the 70:1 grease pumps are applicable with several sizes of kegs ranging from 25 to 120-lb. kegs for the former and 400-lb. kegs for the latter.