The Drain Valve Set from GARDENA protects your Pipeline, Sprinkler System and Original GARDENA System from possible frost damage. The set consists of a standardised auto air valve, plus three different attachments with the Original GARDENA System Hose Connector, the Original GARDENA System Nipple and the Profi System Nipple. To remove water residues from a pipeline system, for example, use the hose connector attachment. First you screw the air valve onto the attachment and then connect it to the outlet of the Pipeline Water Station. You will need either an ordinary bicycle pump or an air compressor. The compressed air blows the system free of water, preventing frost damage. The Drain Valve Set is a quality product engineered in Germany. Water wherever it is needed. The easy access to water: pipelines below ground.