I am planning to replace a single appliance valve with a dual appliance one, see the photo. I don't think I'll have enough space for wachine machine/dishwasher connections where the old single valve is and am thinking now to cut the horizontal copper pipe and put a valve there. Just wanted to check if it's ok for the valve to be installed horizontally, normally they are pointing up. Any advice would be appreciated.
One of these would probably do the job. Do you have enough clearance below for the new appliance. They are better to be facing down rather than up, easier to drain if necessary.