a manual drain valve having an open position and a closed position, the closed position being configured to prevent fluid drain to a drain pipe, the manual drain valve comprising:

an elongated valve stem,

a drain cover coupled to the valve stem at a first end,

a poppet coupled to the valve stem at a second end,

a valve body comprising a valve seat designed to sealingly mate with said poppet and a support member designed to slidingly support the valve stem, the valve body being configured to attach to a sink drain hole at a first end and a to a drain pipe at a second end, the valve body further comprising at least one bypass port located adjacent said valve body first end and above said valve seat; and

an automatic drain valve in fluid communication with said bypass port and said drain pipe, the automatic drain valve being operable to automatically open a bypass drain path for passage of overflow fluid from the sink to the drain pipe when the manual drain valve is in the closed position and an overflow level of fluid is in the sink, the automatic drain valve comprising:

a float valve seat operable to pass the overflow fluid to the drain pipe; and

a float stopper shaped to sealingly mate with the float valve seat when the bypass drain path is closed; and

a magnet operable to magnetically attract the float stopper to close against said float valve seat, thereby shutting off the flow of overflow fluid therethrough.