External lever easily adjusts spray from fast fine streams to a soft slower flow Provides invigorating spray using 2.5 GPM Includes the 5 Flow Rate System, a series of 4 brass discs that allow the consumer to adjust the flow rate to what works best for their water pressure and needs 1/2 female connection, installs easily on all standard shower arms The adjustable flow restrictor allows better performance in low pressure Solid brass construction is polished and chrome plated for high luster appearance. Standard Model - 1-3/4 Dia. Finish=Chrome