On the valve it says "up" but if you install it that way it will be upside down. I called to clarify that and assumed the Handy installer would be familiar, but he wasn't and sodered it upside down and had to redo it with 3 repeated trips to the hardware store for supplies he ran out of. He was there 8 hrs and at one point wanted to abandon job with my water supply turned off and a leak from the copper pipes. Hire your own plumber.