Missing tap part

[bigbaddom]

Hi

Hoping someone here could help.
Can anyone tell me what the part at the bottom of the tap is called? Shown on the right of the image.

I am missing it and its proving hard to explain on the phone.

Thanks!

[bigbaddom]

exactly its a 3 hole tap.
That isnt the exact tap but its the only picture I could find online.

Thanks will give tee a try