1. Dual flush operation designed for closely coupled cisterns, this toilet push button offers efficient water management with dual flush functionality, allowing you to choose between a full or partial flush based on your needs. 2. Compatible with Optima 49 valve, specifically developed for Siamp Optima 49 valves, this button ensures replacement for your existing flush mechanism, providing seamless integration with your toilet system. 3. Easy installation with a 48 mm diameter suitable for standard cistern holes, this push button simply screws into the flush valve, making replacement a straightforward task for most DIY users. 4. Durable construction made from quality ABS material, this silver-colored button is built to withstand frequent use, ensuring long-lasting durability in your bathroom.