Sorry to hear about the length difference in your hydrants, but we are glad that it is working fine. The hydrant length is measured from the back of the flange to the end of the copper, and the connection inlet is not included because there are several kinds of inlets available on that model and are all different lengths. If you have questions about the use and maintenance for your hydrant, give us a call at 1-800-362-9055 or visit our website at www.PRIER.com.