Brass outside hose union 1/2" male threaded bib tap, with a build in double check valve. Suitable for indoor or outdoor use. Includes brass hosepipe connector. Tap connects to a 1/2 inch standpipe / water supply (input) Also A check valve on a garden tap is a requirement of the 1999 water Regulations. An isolation valve inside the property would enable you to shut off the water supply to the tap in winter helping to prevent the tap freezing. *Hose union connection thats compatible with most garden hoses, it also incorporates a double check valve to comply with water regulations. *WRAS approved *Maximum working pressure PN10 *Double check hose union bib tap