Copper Tank Restrictor

[okanikaz]

Hi,
Does anyone know what the device with a blue knob does on the return pipe from my gravity fed indirect copper cylinder. It has no electrical connections.
Please e.mail any response to:-
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Many Thanks
Phillip Parsell

 

[unguided1]

Hi Phillip
I hope this helps
Google Image Result for http://www.uk-plumbing.com/bmz_cache/e/e070a5aec6ce08b01c54739e126b0ada.image.200x199.jpg

Regards
Mike

 

[okanikaz]

Hi Mike,
Thanks for the info.
Regards,
Phillip Parsell