Single-control shower mixer for wall mounting with wall ring trim. Progressive cartridge uses one continuous rotation to control both flow and temperature sequentially. Starting from closed position, initial rotation opens cold water only, then gradually introduces hot water as you continue rotating, ending at maximum flow with hottest temperature. Energy-saving design prevents unnecessary hot water activation. Designed for in-wall installation with valve body concealed. The wall ring creates a clean, minimal look with circular trim. Simpler alternative to thermostatic valves for basic shower installations. Solid brass with hand-finished control.