Unique delay mechanism maintains stable water flow after initiation; ergonomic press design simplifies operation across various toilet arrangements. Optimizes water efficiency in use environments such as apartment complexes, restaurants, and office buildings, with a robust brass construction for lasting durability. allcopper manual press delay flush valves provide erosion resistance and watersaving timed flushing for efficient bathroom fixtures. Guide without brass cores withstands extreme humidity and frequent use, delivering leakproof performance for floormounted or wallmounted toilet systems. Use scenarios: Multistall apartment complex restrooms requiring consistent flushing performance with minimal maintenance. traffic restaurant restrooms where reliable operation and water savings are critical. Office buildings with both floormounted and wallmounted toilet systems needing flexible compatibility and durable performance.