yes it is and underneath it attached is a down pipe and u bend upwards about 8 inches then a down pipe into the floor of the cupboardStand back and take a wider pic please
If you empty some of the stuff out if the way we will be able to follow the path of the pipes
Is the T- piece perfectly horizontal?
I think there might be detritus lying in the horizontal pipes, especially the dead end in the T piece.
Washing Soda Crystals are good for cleaning it out, and will break down fatty deposits. Spoon the crystals down the waste and overflow, add just enough boiling water to moisten them, but not to wash down the drain, and leave overnight. Run a little more boiling water slowly down the next day.
Once they are reasonably clean, soda crystals and about a mug of boiling water once a week will keep them clean.
I expect you know never to tip cooking oil or fat down the sink, and you wipe out grill pans with kitchen roll.
It is fairly difficult to clean out pipes when the solution runs away. It's possible to dismantle them as I think you have screwed joints, not glued, and scrape them out in a bucket.
If you have a dishwasher, I think running the strong detergent and very hot water through the pipes may help keep them clean.
I can see something grey going down near the right hand end of the T piece, what is it? What is the red plastic thing? The shelf and stuff are in the way. I have done all that you say above many times. It doesnt help.
It does look strangely complex. If the replacement has a trap directly beneath the sink, there would be practically nowhere for waste to collect.Looks like IKEA waste , they often leak , I would replace the existing waste with new .There is too much pipe work before the U bend allowing waste to collect and smell.
Ikea supply a selection of waste pipes for their sinks , whoever fitted it thought they had to use all the fittings supplied, the T section should fit directly below both sink wastes and then go directly into Trap.It does look strangely complex. If the replacement has a trap directly beneath the sink, there would be practically nowhere for waste to collect.
We cleaned all the underneath plastic pipes thoroughly but the smell came back.thanks to all respondents - husband is dismantling that T now..will let you know what we find eughhhh
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