BodySpa™ Brushed Nickel 3-Function Handheld Shower Head with 60" Hose (26488) by Oxygenics®. Most Oxygenics products are WaterSense-certified, meaning you don’t have to worry about water regulations. PSI (pounds per square inch) measures water pressure while GPM (gallons per minute) measures the flow rate of the washer. So, the lower the GPM and the higher the PSI, the bette...