• Product purpose: provides a dual flush mechanism to conserve water while ensuring reliable flushing performance
• Certified compliance: WRAS and NF approved for UK water regulation and high-standard installations
• Adjustable height design: height adjusts from approx 282 mm to 430 mm (or up to 448 mm in some specs) to suit different cistern sizes
• Universal fit: suitable for plastic or ceramic cisterns, lid-hole diameter from 16 mm to 50 mm and discharge hole from 58mm to 72mm
• Flush volume settings: small flush adjustable from approx 2 L to 4.5 L, overflow tube and dead-water level also adjustable for optimum performance
• High performance rate: high flush rate up to 3.5 litres per second for effective bowl clearing and dependable operation

The Siamp Optima 49 Dual Flush Valve is a versatile and high-performance flushing mechanism designed for modern cistern installations. With dual flush capability it supports water-saving operation without compromising on flush power. The adjustable height design and compatibility with both plastic and ceramic cisterns-plus lid-hole diameters from 16 mm to 50 mm-means it fits many standard and replacement installations. Performance features include adjustable small flush volumes from approximately 2 L to 4.5 L, an adjustable overflow/dead-water level and a high flush rate up to 3.5 L per second. WRAS and NF certified it meets stringent UK standards and is suitable for both domestic and commercial applications. Ideal for new installations or refurbishments where reliability, flexibility and compliance matter.