Push button for Siamp Optima 50 toilet flush valve, complete with plastic back nut.
This is the more common standard size button, which measures 45mm across the top.
This ONLY suits the cable operated Siamp Optima 50 flushvalve.
Please note there are many varities of push button assemblies.
Care should be taken before ordering to ensure yours matches the photographs exactly. This particular model is not spring loaded.