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Locating the pressure valve to my Baxi Combi 80Eco?

I am trying to find the pressure release valve to the baxi 80 Eco. There are a number of pipes that feed into the boiler, 3 possible pipes with a black tap.
Which do I use?

Current pressure reading zero and the radiators need bleeding.
Troubled, January 2010
link Click here to see other fixes for Baxi 80Eco.