Transmission Main – Larger Diameter mains tha bring water from the Water Plant to the city. Usually 16″ to 48″ in diameter.
Distribution System – Smaller pipes that move the water around the city. Usually 4″ to 12″ in Diameter.
Mainline Valve – The valves that regulate the flow of water through the mains.
Mainline Valve Box – 6″ diameter lid to access the valves. Sometimes seen in roads and tree lawns.
Corporation Stop – The tap in the main where the service line attaches.
Service Line – The water line that feeds the home or business from the main. Usually copper.
Curb Stop – The valve that opens and shuts off the water supply outside the home or business.
Curb Box – the access to the Curb Stop. The lid is usually 4″ in diameter and located in the treelawn, sidewalk or driveway apron
Meter Valve– The first valve within the home that controls the flow of water in the home or business.
ARB – Automatic reader box. Located outside the home used by the meter reader.