Turn on the fun in your shower just by turning on the water. Polished stainless steel finish. Five-layer plating, to prevent surface scratching. Material: Heavy Duty Metal. Regular Working hydraulic pressure?40 PSI Regular Working water flow?1.8 GPM. Plating: use of advanced plating process, acid copper, nickel, chromium, titanium multi-coating, uniform color, and excellent corrosion resistance, to ensure the bright sheen of the product surface. PLEASE NOTE: This system comes with an Advanced Thermostatic Mixing Valve, and also gives you flexibility of using one function or any combination at at the same time.