Correct Answer - Option 4 : Polythene tubes
Polythene tubes are used for cold water services.
Lead pipes are used for sanitary plumbing.
Copper tubing is used for carrying hot water inside buildings and factories. It is most often used for heating systems and as a refrigerant line in HVAC systems.
GI pipes are used for acidic and alkaline water. These pipes are also widely used for conveying raw water & distribution of treated water in the majority of rural water supply schemes, where the requirement for water is less.
