Air Admittance Valve leaking

[cantonin]

Hi, I have an AAV fitted to the soil stack that terminates in my loft. It's a McAlpine VP50P and I've noticed that there is condensation dripping from it.
This is the second one I've had in just over 2 years as had the same issue with the other one.
When I remove the top the sealing ring that keeps it closed is all wavy so is not creating a seal ( have included a pic)
Are McAlpine products not very good or have I just been unlucky and am I better off fitting a different brand?

 

[oilboffin]

Usually goodie I was you the new one I'd smear the washer with waterproof grease see how it goes
Bob

 

[John D v2.0]

is your loft getting extremely hot? you might get some joy from their tech department, you don't want to be forking out 20 quid a time.

 

[Newboy]

Or have you any discharge pipework running into the stack?

Water heaters, unvented cylinder etc

 

[cantonin]

Thaks for the replies,
The only thing conneted to the stack is the toilet, bath and sink and. This AVV worked all through the heat of last summer so don't think it's excessive heat in the loft causing an issue.

 

[Madrab]

I'd get in touch with McAlpine themselves and talk to them about it. I'm sure they will want to know about this and will want to understand what's going on.

They are probably the best manufactures I have found for plastic plumbing.

 

[cantonin]

Thanks, I will contact McAlpine and see what they say.