Series 100 Truck, Holds 2 Cylinders, 7 1 2 in to 9 1 4 in dia, 7 in Semi Pneumatic Plain Wheels ORS NASCO leaving no detectable residue Non corrosive to leaving no detectable residue Non corrosive to metals Valve sprays in upright and inverted positions Safe for use on most plastics and safe handling Built in check valves prevent the reverse flow of gases Strong and compact in design having excellent balance and rollability All models have a cylinder hold chain and hose supports Concealed angle legs prevent load from resting on wheels when truck is stationary Handles small to medium cylinders Recommended for small shops and garages having hard surface floors