The maximum flow rate of this shower faucet set is 1.46 gpm or 5.5 L per minute, and it is made with a high quality stainless steel SUS304 rain shower head and a solid brass pressure balancing mixer valve for long lasting durability and dependable performance. This rain shower system uses innovative air injection technology so the 10, 8, or 12 inch shower head mixes water with air to increase pressure and create a natural rainfall experience. The shower valve kit is designed for rough in valve installation and comes with all accessories and instructions included. The set contains a square rain shower head, a handheld shower spray, a 59 inch shower hose, a 13.7 inch shower arm, a handheld holder, a pressure balance valve, a panel, a handle, a cover and all required installation hardware. The system also features a cUPC certified pressure balanced valve that prevents sudden temperature changes and helps avoid burns while maintaining a steady temperature to ensure the safety and comfort of the entire family.