What plumbing waste part do I need to fit a dishwasher here?

[KAgantua]

Got a dishwasher arriving for my mum today, there used to be a DW there before she moved in.

The old waste pipe for the DW used to be in the top right.

[KAgantua]

Thannkns 2mCVs.

Edit - as per post above it controls the pop up waste.

[KAgantua]

Thanks guys there was indeed a blanking cap inside (Like a washer but without the hoe in the middle) I removed it and fitted DW, all good now.