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Discuss Odour from internal manhole cover - how to seal? in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
15
Hi,
I've an internal manhole cover in my garage, covering the main waste drains. Only moved into the house about 6 weeks ago but noticed it occasionally smells a bit cabbagey around the area of the cover.
Have lifted, checked for blockage and cleaned out somewhat but still get a bit of smell now and then. Looking at the cover, it looks like the seal might be past its best, so I was thinking of applying a good layer of manhole grease around the edges but wanted to see if anyone had any better suggestions?
Thanks,
Ben
 

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rpm

Esteemed
Plumber
Messages
12,552
Wash both surfaces and applying grease is a good way simple way to start with.
 
Messages
15
Thanks RPM, do I need manhole grease or could I use some alternative from Screwfix etc. that's available in a smaller quantity? (ideally don't want to spend £35 on a 3kg tub of grease)
 

rpm

Esteemed
Plumber
Messages
12,552
Thanks RPM, do I need manhole grease or could I use some alternative from Screwfix etc. that's available in a smaller quantity? (ideally don't want to spend £35 on a 3kg tub of grease)
Well, going by another post on the same subject somewhere else recently a respected poster said even Vaseline would do, of course any nicks in the seal and it wont seal properly.
 
Messages
15
@rpm when you say any nicks in the seal, do you mean the rubber seal in place or the seal I'd create with the grease?

@Ben-gee do you mean tear out the existing rubber seal and replace with EPDM?

Thanks
 
Messages
15
Understood. I might remove the old rubber seal and replace with something similar before applying grease. At the moment, the old seal has gaps in it. This might be a dumb question but does it matter what shape the seal is, as long as it fits into the groves? E.g. this Stormguard EPDM Rubber P Strip White 20m - https://www.screwfix.com/p/stormguard-epdm-rubber-p-strip-white-20m/33145#product_additional_details_container looks different from the seal that's currently in there but not sure if I can find an exact like for like
 

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