Kitchen sink gurgling and overflowing from air inlet

[Prentle]

Hi there,

So I have thrown several methods of drain cleaning from each side of the sink which has improved the issue but it still persists.

When draining larger amounts of water from the kitchen sink, or when the washing machine drains out, water starts backing up and coming out at point one.

Also as water does drain away lots of gurgling from point two.

Thinking drain is clear but a vacuum is in there somewhere stopping water from draining quickly?

Dismantled as much as I can and cleaned lots of crud out. Also used auger from front of house and cleared out a load of gunk and smaller auger down the pipe under sink as far as I can.

 

[snowhead]

Point 1 should not be open.
Needs capping lower down where the nut is.

The 40mm pipework from the T piece at the back of the cupboard to wherever it goes next is probably partially blocked.
Needs the 40mm white waste dismantling and clearing.

 

[Prentle]

interesting to know, it has always been open but in the last few weeks water has started flowing out of there in larger amounts. I will cap it off anyways as suggested, that can only help. Thanks

Will also see what I can do to try and unblock after that T-section. it's tricky to get to as at the back of the T it curves down quite quickly so hard to get the sink auger down there.

I have some powder drain cleaner due in the next few days so will flush that down the pipe at point 2 to get more directly to that T junction area.