The maximum flow rate of this shower faucet set is 1.46 gpm or 5.5 L per minute and it features a high quality stainless steel SUS304 rain shower head along with a solid brass pressure balancing shower mixer valve to ensure durability and reliable performance. Using innovative air injection technology, the large 10, 8, or 12 inch rain shower head combines water with air to increase pressure and create a natural rainfall experience. The shower valve kit uses a rough in valve installation type and includes all necessary accessories and instructions. The set comes with 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 complete installation hardware. The system is equipped with a cUPC certified pressure balanced valve to prevent burns caused by sudden changes in water temperature and to maintain a constant temperature for the safety and comfort of the entire family.