External lever easily adjusts spray from fast fine streams to a soft slower flow. Provides invigorating spray using 2.5GPM. Includes the 5 Flow Rate System, a series of 4 brass discs that allow the consumer to adjust the flow rate to whatworks best for their water pressure and needs. 1/2" female connection, installs easily on all standard shower arms. Theadjustable flow restrictor allows better performance in low pressure. Solid brass construction is polished and chrome plated for high luster appearance.