Brass Craft B3-12A F 1/2-Inch Comp by 1/2-Inch FIP by 12-Inch Brass Craft B3-12A F Faucet Connector 1/2-Inch OD inlet Outlet style: 1/2-Inch FIP (faucet) Metal Nut More flexible than stainless steel Easier installation (especially in cramped quarters)