This copper tube sizing instruction booklet and calculator have been prepared for the use of journeymen, plumbing and heating contractors, engineers, and others involved in the design or installation of fire-sprinkler, plumbing, or solar heating systems. They have been compiled from information sources that the Copper Development Association Inc. believes to be competent. However, recognizing that each system must be designed and installed to meet particular circumstances, CDA assumes no responsibility or liability of any kind in connection with this booklet and calculator or their use by any person or organization and makes no representations or warranties of any kind thereby.