Can anyone let me know what this thing is, below the drain valve? It's just above the mains stopcock under the sink. Why might it be corroded after only being installed a year ago, and what does the screw do? Is it a water pressure restrictor, or an isolation valve, or something else? It doesn't look the same as the other service valves in my flat... Thanks!
What's this valve for...?
- Thread starter alex1b
- Start date
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