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Discuss Greenstar 30i drips when filling. in the Central Heating Forum area at PlumbersForums.net

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Hi all , went to a small top up on 30i yesterday at daughters house. Turned key , opened white valve gently , then water started to drip from right of filling key. Appeared to be coming from a small black knob to right of key.
This seem a little loose so gave a gentle tighten. Any ideas what this is?
Pressure relief? Need to loosen again?

Cheers for looking

D 🙂👍
 
Just a backflow device eg check valve should be hand tight
 

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