Siamp Dual Flush Button Optima 49

The Siamp Optima 49 dual flush button, for use with the Optima 49 dual flush valve. Supplied with an optional collar to raise the button from the lid. When fitted without collar the button is compatible with lid hole diameters from 39mm to 42mm, when fitted with the collar the button is compatible with lid hole diameters from 20mm to 50mm.