KleenWater Reverse Osmosis RO Kitchen Faucet, Air Gap Brushed Nickel Water Faucet, Luxury European Style Brushed Nickel Elegant Euro Style Design Lead Free - Conforms with Federal Reduction of Lead Act 2014 The minimum mounting hole required is 1 1/4" diameter. The maximum hole diameter covered by the escutcheon plate is 1 5/8" Compatible with both 1/4" and 3/8" water line - Free and Fast Shipping Includes 3/8" Drain Clamp and Drain Tubing