A system and method for establishing plumbing kit specifications for kits containing plastic hose or tubing for installation on boats, RVs or other uses where ruler markings are imprinted longitudinally along the outside surface of stock hose. The ruler markings can be spaced approximately one inch, or other distance, and can include a series of numerals such as 1-12 or 1-11 followed by a repeat symbol. The sequence can repeat indefinitely along the length of the hose. The method allows a length specification for a particular hose segment to be generated by cutting a piece of stock hose at a particular starting ruler mark, clamping or connecting it in place, and then completing the installation of the segment by cutting the second end to the correct length and clamping or connecting it in place. The length can then be computed by reading the ruler marks on the installed hose. This information can be entered as part of the specification for a hose kit.