Highcool THU224 Top Flush Kit for Aquia Series Two-Piece Toilets — Fits CST414M / CST416M

Overview: Replace a worn flush assembly with the Highcool Toilet Flush Part THU224 — a 2-inch top flush kit designed to restore reliable flushing performance for Aquia series two-piece toilets. Compatibility: Total flush height: 12-3/8 inches. Compatible with Aquia (412), Aquia (413/414), Aquia II (416), and Aquia III (464) toilet models, including CST414M and CST416M. Easy DIY Installation: No plumber required. This unit is engineered for straightforward installation so you can install it yourself in 10 minutes or less and get your toilet back to working order quickly. Durable Construction: The top flush kit is built to perform across varying water pressures and conditions. It features a 2-inch flush valve and thickened rubber components that help minimize leaks and maintain a tight seal for long-term reliability. Water-Saving Dual Flush: Equipped with two flushing options—full flush and partial (half) flush—this dual-flush assembly lets you choose the appropriate flush volume to conserve water and reduce utility costs.