Siamp Monaco Flush Valve Optima 50 Dual Flush Universal with Push Button

Genuine Siamp Spare. Replacing this for other Siamp valves allows you to install a new one without having to unbolt the pan and cistern making it so much quicker and easier! The Optima 50 flush valve will replace an Optima 49, Skipper 45 & Storm 33a also.

eBay