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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
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
link Click here to see other fixes for Vaillant.