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With the use of this Extension Joint, a hose can be easily extended. The Extension Joint can also be used for changing two hoses with different diameters, e.g. from 19mm (3/4") to 12.5mm (1/2"). Specifications • Size: 1/2" / 12.5mm Contents • Double Ended Male Hose Pipe Connector 1/2" / 12.5mm (x1)