The Siamp Optima 50 Dual Flush Valve delivers cistern compatibility and precision flush control for residential and commercial installations. Featuring dual flush actuation with adjustable small flush settings from 2 litres to 4 litres, this valve accommodates both 1 1/2" and 2" outlets. Cable-operated functionality enables flexible actuation positioning, allowing lateral or head-on installation configurations. The actuation effort remains below 20N, ensuring accessible operation. Compatible with lid holes ranging from 16mm to 50mm, with collar options determined by diameter. The adjustable overflow can be cut in 4mm increments for precise water level management, while the adjustable dead water level provides installation flexibility. A high flush rate of 3.5 litres per second ensures effective performance, supported by a supplied foam pan seal that compensates for pan irregularities. Features & Benefits: Suitable for plastic and ceramic cisterns in residential, commercial and public facilities. Dual flush operation with adjustable small flush from 2 litres to 4 litres. Cable-operated actuation enables distance operation in lateral or head-on positions. Actuation effort below 20N for accessible user operation. Compatible with lid holes from 16mm to 50mm, with or without collar depending on diameter. High flush rate of 3.5 litres per second for reliable performance. Adjustable overflow in 4mm increments and adjustable dead water level for installation flexibility. Foam pan seal supplied for compensating pan irregularity. Outlets: 1 1/2" and 2".