Hello, Jo Anne! Thank you for your question. The flow rate coming from the spout cannot be adjusted except on the cold side. The volume is determined by the water pressure in your home, and you can find a flow rate chart in the Technical Specifications linked below.
The hand shower is currently designed to run at 1.75 GPM at 80 PSI. You can lower the flow rate to 1.5 GPM by purchasing and installing the RP62734 Flow Regulator Washer, or you could use a Volume Control such as the model U4760-PK, which will allow you to manually adjust the flow rate from the hand shower.
Best regards, Jon
Date published: 2018-10-18