This toilet flush valve accessory features a 1" IPS inlet and 1-1/2" top spud outlet, offering universal compatibility with both commercial and residential toilet systems. It uses a water-saving 0.8 GPF low-consumption design, powered by precision flow control technology to deliver strong flushing power while minimizing waste via its non-hold-open handle that fixes a consistent water volume per flush. Built with a solid brass core for superior durability and reliable leak-proof performance, it protected by a 4-layer anti-corrosion material that fends off rust and oxidation for long-lasting reliable operation. Additionally, it includes a built-in vacuum breaker to effectively block reverse water flow, maintaining consistent system pressure to ensure smooth, trouble-free flushing performance over extended periods. Material: Copper.