Bottle Gully and Kitchen Drainage

Phillip Stephens · 12 Feb 2021

Hi..I am looking at getting an extension and I'm hoping to get help with a question on my current kitchen drain. The kitchen drain exits the house into a gully trap with a rodding eye cover. The question is can I convert this drain into into a straight run without a trap as any trap will not be accessible. Or if I should put one in, this will be buried under the new extension with no way of clearing any buildup in the bottom bit of the trap. Or can I put in a trap before it enters the Inspection Chamber or does it have to be directly where the kitchen drain exists?Any help will be much appreciated. Thanks

23vc · 12 Feb 2021

The only trap you need is the one attached to the sink waste. But you want it running in 110mm orange pipe as soon as it hits the inside floor level, don’t run 40mm underground.

Hugh Jaleak · 12 Feb 2021

As above. Use a 110-40mm drain adaptor to reduce to 40mm pipe at floor level, then use a trap with a minimum 75mm seal depth on the sink.

Phillip Stephens · 12 Feb 2021

Cheers 23vc. We will be running 110 mm underground. What about vermin and smells, would the removal of the external kitchen gully be a cause for concern in this regard?

Phillip Stephens · 12 Feb 2021

Any idea as to what function this gully is currently providing? We have in the past had to clear debris and kitchen waste from it. Does it removal mean that the kitchen grey water will have a straight run to the IC, is this acceptable? Thanks

Hugh Jaleak · 12 Feb 2021

Yes, a straight run to the chamber is acceptable, gullies are often used for connecting waste pipes to the sewer, its usually down to the architect as to what was specified for the build. See my comment on your other post regarding access to the run, especially as you've already noted you've had to clear detritus from the existing gulley.

Building Regs specify a deeper trap if the appliance is connected directly the drain or to a stack to prevent the trap being pulled by other appliances discharging. Rats will happily live in a sewer, although they will look for a dry section to nest in. They only really make an appearance if they find an easy exit, e.g. a broken pipe or a disused WC, and will come out in search of food. A properly designed and constructed drain should not pose a problem.

23vc · 12 Feb 2021

Phillip Stephens said:
Any idea as to what function this gully is currently providing?

Guess it’s from the days where they’d collect the rainwater too, and you couldn’t easily plug a 1.5” into a clay pipe. To be fair I’d normally still use em, provides an external rodding point and place to pour water down...

Phillip Stephens · 12 Feb 2021

Thanks all. That’s certainly put my mind at ease regarding the gully.

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Bottle Gully and Kitchen Drainage

Phillip Stephens

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Hugh Jaleak

Phillip Stephens

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