W124 Pierburg / Stomberg Carburettor Bits and Advice Needed

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The saga of chasing vacuum continues,

I have replaces all 3off yellow vacuum valves(all 3 were bad) with new ones and it made a big difference with the economizer gauge, its not all the way down now on deceleration(10mm to bottom), all rubber lines are new, the thick rubber sleeve/collar for the carb is new, the vac lines under the dash checked, the central locking vacs checked/replaces and today while changing a bulb i have noticed this valve(green?) with a pointer on it on the line coming from the inlet manifold to this splitter and further inside the car, the arrow pointing from manifold to the splitter (correct?) after checking it it works both ways, which means its broken, there is no part number on it, how do I buy replacement? Do you guys know the part number or what to buy?

Can someone tell me whether I have fitted the yellow valve which i have replaced with new, the right way?
 

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