Cleveland 42018GR15BN Cornerstone 1-Function Showerhead - Brushed Nickel Finish. The 42018GR15BN is a genuine product manufactured by Cleveland Faucet Group. This particular product is a Single-Function Showerhead and has a beautiful Brushed Nickel finish. The showerhead is part of Cleveland's Cornerstone bath collection and gives your shower a simple beauty. It has a 1.5 gpm (gallons per minute) flow rating which meets WaterSense criteria as a water saving product that still provides high-performance.