Is this an accumulator?

[Jennie]

Hi all,

Does anyone know what this is (in a kitchen cupboard, under the kitchen sink)? I'm wondering if it is an accumulator. Mains water pressure is very low in the property. There's a bleed nipple on top, but it seems very small for an accumulator.
Thanks for your advice everyone.
Jennie

 

[ShaunCorbs]

Well/ boarehole supply jennie ?

 

[Jennie]

Well/ boarehole supply jennie ?

The house is in a suburban street. But we can't find the outside stop tap - the water board is coming out to investigate.

 

[ShaunCorbs]

I wouldn’t say it was for accumulation due to the small bore pipe coming off it