Metal Feed & Expansion tank for primary circuit on MF St

[armchairsupervisor]

Hi all,
Was wondering if anyone can point me in the right direction with regards to purchasing a metal feed and expansion tank with copper float for the primary circuit of a multifuel boiler stove, needs to be approx 4 gallons to allow for expansion, can find loads of plastic ones but i require a metal one.
Many Thanks

 

[Charnwood]

http://www.ebay.co.uk/itm/Galvanise...K_BOI_FarmingEquipment_RL&hash=item2eb7251f37

 

[Norcon]

http://www.eco-equipped.com/metal-feed-expansion-header-tank.html

 

[Nige F]

www.yourlocalscrapyard.com