Anyone know what this is called?

[R.Oak]

Hi chaps, looking for help to find a replacement one of these. Im not even sure what its called. Ive seen strainers before but never with the bottle on top. Anyone know what its called please? Thanks

 

[snowhead]

Shock arrester;

Altecnic pneumatic shock arrestor dull 1/2 " bsp

 

[Masood]

Strainer and shock arrestor combined in one by the look of it. Never seen one though, sorry! Is there space to put separate units?

 

[townfanjon]

Does it leak ?, the vessel may pump up .

 

[1Steven]

They used to have similar on the old Vaillants. Sorry I can't link it as I am new try ebay
VAILLANT WATER HEATER VC 15 20 & VCW 15 20 EXPANSION VESSEL 181025

 

[Stanios]

Good grief! a Frankenstein creation if ive ever seen one

 

[MarkAqua]

Strainer and shock arrestor combined in one by the look of it. Never seen one though, sorry! Is there space to put separate units?

what this man said