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Sounds good, but what is a bunging kit? Have got a Screwfix catalogue here and tried on the Plumb Centre on-line but nothing showing as that, does it have another name?

Thanks gents for your replies. As it is a properly vented system fitted by a fully qualified plumber 4 years ago, why would he fit an aav other than to make it easier for himself when commisioning the system? Also If I do just fit another aav, will I need to partially drain the water level...

Hi gaz, it is a non sealed system, with expansion tank in loft. Please see my first post. This is all ok and working fine i,e water level in tank is low and ball valve operating fine. If I took your advice and fitted a manual bleed key fitting would this be safe, or do I have to have an auto...

Hi gaz, thanks for reply, yes it is the air vent but the exact description in the Screwfix cat is an auto bottle type air vent and valve. No if I screw the knurled top down tight it still lets water out through the two little holes on top. If I have to replace this, will I need to partially...

Hi everyone, hope you can help. I have a problem with the above item which is spewing water out when started up from cold or after a bath has been run etc. I have a 4 year old property which has a Halfords Hero boiler and a vented heating and hot water system. Every thing has worked fine...