Which BSP reducer for new kitchen sink

[Mark S01]

Hi

I have purchased a new Clearwater kitchen sink. It came with full plumbing kits, including two basket outlets. The main kit won't fit under my sink so I'm going to have to cannibalize the existing pipe and connectors. This all means that I need to connect the main sink's existing overflow pipe to the new basket's side inlet. The pipe appears to have a female 1" BSP connector. However, it's the new basket's inlet I can't identify

It's male and its diameters are:
- internal: 32mm
- minor: 35mm
- major: 37mm

I assumed that this is a 1 1/4" BSP male, so I ordered a McAlpine S12C 1 1/4" x 1" BSP reducer. However, it is far too wide for the basket's inlet.

Anyone know what I should be ordering?

Thanks
Mark

 

[Geofd]

Take some pictures so we can see underneath

 

[Mark S01]

Take some pictures so we can see underneath

Thanks. See below.

The sink photo shows the outgoing sink. The overflow pipe to the left of the red square will probably need to be kept for the new sink. The coupling highlighted is 1" BSP. The basket to the right will be discarded

The other photo shows the new basket and its side inlet which I need to connect the existing overflow to. The 1 1/4" McAlpine reducer is to the left of the tape measure.

The basket's side inlet seems too big for 1" and too small for 1 1/4"