pipework

noun

Etymology: From pipe + work.

1. Any system of pipes or tubes; piping.

   “The amount of external pipework is also unusual in a British locomotive, though apparent in the most recent L.M.S.R. designs, such as the Class "4" 2-6-0s; but while lacking the tidiness of the old school of British locomotive engineering, this has obvious application for maintenance purposes in present circumstances.”

2. The pipes and stops of an organ.