A sleek, in‑wall TOTO EcoPower high‑efficiency flush valve featuring a 4" × 4" stainless steel cover plate mounted with tamper‑proof screws, designed for wall‑hung toilets with a 1½" back‑spud inlet. It includes an integrated 1" angle stop and 1½" vacuum breaker set, ensuring reliable water control and backflow protection. Operating at 1.28 gallons per flush, it is powered by a self‑generating hydro‑turbine system—no batteries or external power needed—and features a self‑cleaning piston valve with 360° filter, self‑adjusting sensor, manual flush override, anti‑ghost flush timing, and an automatic maintenance flush after 24 hours of inactivity. It meets ADA, WaterSense, CalGreen, and California Title 20 standards.