The Siamp Optima 50 Dual Flush Cable Push Button Chrome 34495009 is compatible with the popular Optima 50 dual flush valve used by various companies like Twyfords and Leicico. It is also suitable for many suites supplied by leading DIY stores. The button is connected to a flexible cable and has an easy clean design that clips into the cable block. It does not require any screwing into the valve (see picture 3). Additionally, a chrome spacer shroud is included to allow for installations in cistern lids with holes ranging from 20mm to 50mm. Please note that this push button is specifically designed for use with the Siamp Optima 50 cable operated Flush Valve.