Symmons Dia Series Hand Shower System with Temptrol Pressure-Balancing Valve, ADA-Compliant, 2.5 GPM, Polished Chrome - 3503-H321-V-CYL

Hi there! Thank you for your query about the Symmons 3503-H3210-V-CYL handshower system. This handshower utilizes the Temptrol pressure-balancing mixing valve, which features an adjustable stop screw to limit the handle's rotation, thereby controlling the maximum water temperature. However, this system does not include a built-in volume control for adjusting water flow rate. The water flow is primarily determined by the flow restrictor installed in the hand shower, which comes standard at 2.5 GPM. Optional flow restrictors are available to reduce the flow rate to 2.0 GPM or 1.5 GPM, depending on your preference. If you require adjustable water flow during use, you might consider installing an in-line flow control valve or selecting a hand shower model that includes a built-in flow control feature. We hope this information helps. Thank you for visiting PlumbersStock. Have a great day!