The Gardening Coupling with Flow-control Valve serves the infinite adjustment and cut-off of the water flow in the hose, the Coupling is used as a connection between 2 hoses You can directly regulate or cut-off the water flow in the hose, this saves you a trip to the tap for regulating water flow, the Control Valve is ideally suited for e.g. regulating the range of a sprinkler Mainly used for on-off controlling or flow regulation of water, typical usage includes garden irrigation system, piping system and water pump Tool-free hose installation, the hose can be put into use immediately, with adjustable water stream and its water flow can be shut off by turning the grip