Abstract: The system includes means for providing different temperature, in the inner air injection area and the outer air injection area. Due to the temperature impact the lice will be stimulated to leave the scalp and be guided into or through inner membrane, where an additional temperature action will kill the lice.

Abstract: A valve device for self-watering of livestock has a valve with a valve housing located in frost-free surroundings, a subterranean well. The valve device has a sliding valve body arranged to open by actuation of an animal for discharging water through an outlet opening provided in a delivery tube. Water is discharged into a drinking bowl or nozzle disposed at a level above ground convenient for the animal. The valve body is arranged to close for water discharge through the outlet opening under subjection of water pressure in an inlet opening. The valve body may be controlled remotely from the drinking bowl or the nozzle. The valve body is arranged such that the delivery tube and the valve housing are automatically emptied of water when the valve is closed, for example, when only the valve body is subjected to water pressure.