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Water dripping from opening at top of pump?

I've got a Vaillant thermocompact that keeps losing pressure. There is water dripping from what looks like a small sticking up outlet on top of a small cylinder attached to the top of the pump. Any ideas what to do to stop the drip ?
Cheers

Rich
April 2015
VaillantHeating, Home Heating SystemsWater Opening Top
It call auto air vent which is jam up ,drain system out when empty pull out pin which hold down air vent get new and replace

ltd
April 2015

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