магистральный трубопровод; распределительная магистраль
- authority's water main
- dead-end water main
- drainage main
- electric mains
- force main
- gas main
- heating main
- heat supply main
- lighting mains
- public water main
- pumping main
- ring main
- rising main
- secondary main
- service main
- supply main
- town drainage main
- trunk main
- underground main
- water main