Premier 1/2 inch injector

[dhic001]

Hi Guys,
I have aquired a Premier 1/2inch injector, identical to the one pictured atthe bottom of http://www.prestonservices.co.uk/injectors.html Doesanyone have any information on these units? Unlike the Penberthy type that I am used to, it has no indication on it of which port is which. Also there seems to be no overflow flap valve, is this common? Any information would be gratefully received to save lots of hassle plumbing it up the wrong way.
Cheers,
Daniel

[steamboatjack]

Folks,
Some Premier injector info attached.
Regards Jack

[dhic001]

Thanks for that Jack, however the injector pictured in that info is quite different from the one I have. Mine has no overflowflap valve, and it appears to have never had one. The injector pictured on Preston's website is identical to mine, and Michael List Brain tells me that they can supply parts for it. I guess the best thing is going to be hook it up to theboilerand see if it works!
Thanks,
Daniel