NEOPERL Shower Flow Control Valve Variety Pack - Chrome Plated Brass Use shower flow control valve to reduce the flow to 1.5 gallons per minute (gpm), 1.75 gpm LEED or 2.0 gpm LEED . You choose your flow rate. Chrome plated solid brass Pressure Compensating  holds flow rate steady 20psi to 80psi Female 1/2"-14 NPT x Male 1/2"-14 NPT