Brass Craft B1-30A F 3/8-Inch Comp by 1/2-Inch FIP by 30-Inch Brass Craft B1-30A F Faucet Connector, Silver 3/8-Inch OD inlet Outlet style: 1/2-Inch FIP (faucet) Metal Nut More flexible than stainless steel Easier installation (especially in cramped quarters)