The Sloan Royal 603 (Model 3018106) is a rugged, manual, concealed diaphragm flushometer engineered for rear-spud water closets, delivering 3.5 gallons per flush (13.2 Lpf). Constructed from semi‑red brass with a rough brass finish, it features a durable PERMEX® synthetic rubber diaphragm with dual filtered fixed bypass to ensure consistent and efficient performance. With a 6 ¾″ “L‑Dimension,” this flushometer is designed for installations requiring short-tailpiece depths and supports both wall-hung and floor-mounted toilets. It meets UPC and BAA standards, accommodates a 1″ IPS inlet, 1½″ spud coupling, and operates across a broad 15–80 psi water pressure range—making it a reliable choice for demanding commercial environments