At Air Cylinders Direct, we believe that it is vital that pertinent information is always just a click away. Therefore, we offer an interactive program called ACD Cross. This cross reference program enables you to enter another cylinder manufacturer's part number and it will give you the comparable Air Cylinders Direct part number. ACD Cross currently offers cross reference for the round body interchangeable product line. It includes all of the popular non-repairable cylinder lines. For now, to cross reference a competing NFPA cylinder line, simply call 1-866-404-5300 or e-mail us at sales@aircylindersdirect.com.