Household plumbing contains the equipment of pipes, furnishings

https://canvas.nau.edu/eportfolios/389/Home/How_Plumbers_Can_Help_Maintain_Your_Plumbing_System_

Household plumbing consists of the gadget of pipes, furnishings, and fittings mounted for water distribution and waste removal in residential buildings. Proper protection ensures helpful operation and prevents high-priced maintenance.