Can anyone tell me the purpose of this valve in my garage In my previous home it was in the laundry room adjacent to The garage Is it some kind of crossover valve between hot and cold systems?enter image description here

  • Welcome to DIY. Your guess is as good as ours. We need pictures of the other side. Nov 28, 2020 at 3:15
  • the purpose of the valve is to selectively stop the flow of whatever is in the pipe
    – jsotola
    Nov 28, 2020 at 7:15
  • turn it off and see what stops.
    – Jasen
    Nov 28, 2020 at 9:58
  • It is possible that could be a main shutoff or if close to a water heater the shutoff for that.
    – Ed Beal
    Dec 2, 2020 at 15:00

1 Answer 1


I had something like this in my garage where a water softener was previously. When the water softener was removed it was easier for the previous owner to just connect the pipes instead of opening up the wall and/or rerouting the plumbing to a less noticible location.

  • The pipes disappear into the wall and run towards The ceiling
    – MarkS
    Nov 28, 2020 at 21:37
  • Thanks for the comments so far. The pipes disappear into the wall and run Inside the wall up towards The ceiling. The valve pictured is old and corroded in position. I put a wrench on the spindle and almost broke it. I’d like to remove the whole thing as I’m trying to install a sink. I bought a 1/4” piercing valve to check For water pressure in the pipe and there is :( The house was built in 1970s and I’m wondering if it’s Related to The water heater nearby or perhaps the laundry Was previously in the garage. I’ve only ever seen anything like this in a laundry room at my last place
    – MarkS
    Nov 28, 2020 at 21:45

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