What kind of elbow connecter is this?

[sushanttheone]

I am trying to remove a faulty eletric shower but I cannot figure it out what kind of elbow connecter is it connect to the cold water supply? It's not seems to be a pressure connector or a weld. How do I take it off?

 

[Exedon]

Tectite classic just push collet back into fitting.
Special tool required or you can get away with a bahco type adjustable spanner.

 

[terryplumb]

Tectite classic
Edit..as above

 

[robinbanks]

Might help to remove wire and all fixing screws from shower then rotate it 90 degrees so gravity is in your favour, per above use an adjustable spanner adjusted for size around the water pipe of the shower, so it can press on the end of the tectite fitting, squeeze the spanner towards the fitting, and also push the shower into the fitting too, briefly, to help the locking collar disengage, then pull the shower down and out of the fitting