Installation hole diameter : between 66 to 75mm , engineered with innovative double flushing valves systems and large diameter design , this pneumatic button ensures rapid , high volumes liquid discharge for superior efficiency in fluid control Ideal for homeowners search upgraded bathroom fixtures and industrial facilities requiring strong , low maintenance flushing valves solution Features ergonomic pneumatic button with mechanisms to leaks , ensuring easy operate and enhances during large demand situation Perfectly suited for residential bathrooms , manufacturing plant , or processing unit where quick drainages and precise flows management critical Constructed from strong ABS and erosion resistant copper , it withstands pressure environment while maintaining long terms reliability and wear resistance, Manufacturer: Zeizafa