Leaving the water on to your washing machine hoses, can cause a serious flood. Rubber hoses fail over time, under constant water pressure. and it seams that they wait till you have gone away for the weekend, or vacation before they let go. You can end up with thousands of gallons of water on your floor, destroying your floors walls and anything else in the home. There is a one handle shut off valve available, you just have to pull down a lever when you need the water on and push it up when not in use. Have your local plumber Install one for you.