If you've ever spilled a tray of developer on your floor, or wished you had a drain for your temperature-controlled water bath think about getting the Jobo Siphon Pump No.4045.
Simply put the main tube into the liquid you want to drain, point the drain tube to the drain or container, and squeeze the bulb until the liquid starts flowing, from then on the gravitational siphoning effect will take over until you interrupt it, or the fluid has all been pumped.