what's this valve?

[Jennie]

Anyone know what the dome straight above the stopcock is (see pic)?

 

[SimonG]

A water meter.

 

[snowhead]

Look under the black flap and see numbers.

 

[Paulus]

never seen one like that but I don't see that it can be anything but a water meter as Simon says.

 

[aplombier]

Possibly ! ! in line shock arrestor , as cant see any dials for it to be meter

 

[helpsy]

Possibly ! ! in line shock arrestor , as cant see any dials for it to be meter

Meter reading digits are under the black flap.

 

[aplombier]

it looks more like a serial plate from what I can make out. Rather than a flap. But could be wrong.

 

[pipefitter]

A Water meter

 

[tamz]

Its a water meter.
Like this

 

[aplombier]

Ok it's a meter

 

[Richie_77]

meter look under the black flap

 

[Roger Welton]

Another vote for water meter, Kent V100 Kentmeters - V100 (PSM)

 

[Jennie]

Sounds like it's a water meter. When I'm next there, I'll look behind it for a gauge and flap. Thanks.

 

[SafeGasInstall]

its a noisy water meter

 

[lame plumber]

just in case theres an arguement here, its a meter for water usage

 

[mountainman]

just in case theres an arguement here, its a meter for water usage

Are you sure?
It could also be a Dihydrogen Monoxide quantification analyser.
BES sell them.

 

[aplombier]

Now you're having a laugh ! ! Mountainman

 

[mountainman]

Now you're having a laugh ! ! Mountainman

No, BES really do sell them.

 

[aplombier]

Just put search in for it and its way over my head. Dihydrogen monoxide lol

 

[SimonG]

Glad we got that cleared up

 

[snowhead]

What we don't know tho' is why the O.P wanted to know.

Curiosity?
It's in the way?
It's noisey?
Someone said they wanted to come in and read the meter under the sink and the O.P didn't beleive them?
It's the wrong colour?