Features: Installation hole diameter: between 66 to 75mm, engineered with innovative double flushing valves system and large diameter design, this pneumatic button ensures rapid, high volumes liquid discharge for superior efficiency in fluid control. Constructed from strong ABS and corrosion resistant copper, it withstands pressure environment while maintaining long terms reliability and wear resistance. Ideal for homeowners search upgraded bathroom fixtures and industrial facilities requiring strong , low maintenance flushing valves solution. Perfectly suited for residential bathrooms, manufacturing plant, or processing unit where quick drainages and precise flows management critical. Features ergonomic pneumatic button with fail mechanisms to prevent leaks, ensuring easy operation and enhances safety during large demand situation . Specifications: Component : ABS, copper Outer diameter: about 65mm/3inch Package Includes: 1xPneumatic valves note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.