EASTMAN 18-in 3/4 In-in Fip Inlet x 3/4 In-in Compression Outlet Corrugated Stainless Steel Water Heater Connector in the Appliance Supply Lines & Drain Hoses department at Lowes.com
ADS 4-in x 4-in Corrugated Adapter Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com