Fluidmaster Mechanical Rod Activated Dual Flush Valve WRAS approved. Button Activated Dual Flush with Water Saving Partial Flush & Full Flush Adjustments. Fits virtually all top button activated cisterns with 2" outlet. Easy to Install with Twist & Release Cartridge for Easy Maintenance. Features a 2" outlet. High performance 2" outlet. Water saving adjustable flush volumes on full and reduced flushes. Fits virtually all top button activated cisterns with 2" outlet. Overflow adjustable from 170mm to 250mm. Easy rod length adjustment. High quality chrome button with easy flush volume recognition. Durable silicone seal. Twist and release action enables simple maintenance.