What is the push fit connection called?

[GUINNESS]

Hello,

The chap that we purchased the bathroom kit from, supplied us a replacement but it was threaded as opposed to push fit
We are wanting a 180mm long spout, with an angle
The one he supplied is perfect except that the fittings do not marry

 

[snowhead]

Isn't the brass fitting in the new spout the same part that's fitted into the shower mixer.
Maybe it just wants pulling out of the new spout?

 

[GUINNESS]

Isn't the brass fitting in the new spout the same part that's fitted into the shower mixer.
Maybe it just wants pulling out of the new spout?

Hello, thank you for your reply ...
That is what I thought - It is secured fast in there
I put the brass threaded end into a vice (with MDF jaws) and pulled hard and twisted manically ... nada
:-(