Megaflo leak - not sure which component this is

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Hi
We have a megaflo cylinder and today noticed our heating hadn't come on. Checking the cylinder the pressure was almost zero and there was a slow drip drip drip leak from the top of the black plastic component - does anybody know what this is and why it might be leaking?
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Many thanks.
 
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Thank you - do you know if we can refill the system to get the pressure up and heating on until we can get a plumber tomorrow? Or is that a bad idea?
 
Hi,

I'm only a DIY'er, so I may be wrong.
But given the inherent risks of an 'unvented' system, I would not consider refilling it.
I'm sorry, but wrap yourself up warm and wait for the G3 engineer to guarantee the system is safe!
Good luck! :)
 
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Good point we've found a few local engineers on the gas safe site that are qualified to work on unvented so will give them a ring in the morning.
Cheers.
 
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See if the black plastic cap will tighten (like a tyre valve cap) and stops weeping. If it does, you can then recharge system until it can be swapped for a manual valve.

As long as safety devices are intact, it'll be fine against overpressure . Get the cylinder serviced by the G3 when he's there... Good to have this checked annually.
 

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