main sewer ![click to hear](/images/speaker.jpg)
Large-diameter pipe that collects wastewater and sewer runoff and conveys them to a treatment plant.
gas main ![click to hear](/images/speaker.jpg)
Pipe that conveys gas to buildings and houses.
water main ![click to hear](/images/speaker.jpg)
Pipe that conveys drinking water to buildings and residences.
service main ![click to hear](/images/speaker.jpg)
Extremely high-flow pipe linked to smaller distribution pipes with far smaller volumes of flow.