Complete commercial shower system includes: an R120SS pressure balance valve and trim, a wall supply with 1/2 in FNPT inlet and 1/2 in NPSM male outlet, a 59 in metal shower hose, vacuum breaker, a three-function water-saving personal shower with pause feature, two-way diverter valve and a 36 in slide-grab bar. Valve features a cast brass body, washerless 47 mm ceramic disc valve cartridge with volume and temperature control, back-to-back capability, integrated check valves and hot limit safety stop. Pressure balancing cartridge maintains constant output temperature in response to changes in relative hot and cold supply pressure.