Mainline - PVC pipe or polyethylene hose that carries the water from the supply, or source, to the laterals. Pressure Regulator - A device that regulates and ensures that the water pressure is kept within design limits for the drip irrigation system. Tensiometer - A device that measures the moisture content of soil. Usually hooked-up in conjunction with an automated system with a controller. Can set watering days of the week, run time per station, and length of time to run each station.
Battery operated valves are also available for hose bibb connections.