A few additional tips: With bathroom sinks, sometimes it's easier to remove the trap and insert the hose directly into the drainpipe where it enters the wall. That way you avoid the hassle of removing the stopper. Just be sure to hold a damp towel around the junction to prevent water backflow from ending up on the floor. Maintain good communication with your partner at the outdoor spigot. In rare cases, you may need to have him or her turn off the water quickly to prevent a spillage.