Any ideas what this is?

[plexer]

It's copper.

 

Ben

[jmak]

Thank you for the sensible suggestions on what this could be. There's nothing the other side of the wall, just a plug socket.

 

Could it be taking a spur feed from the socket to something electrical in the garden? Take the plate off the sucker and see if there anything feeding through the wall.

[Edu-IT]

Could it be taking a spur feed from the socket to something electrical in the garden? Take the plate off the sucker and see if there anything feeding through the wall.

Plate?

[jmak]

Plate?

 

Oh dear. Should have read take the plate off the socket! As in the front part of the electrical socket - I'd call it the face plate, but that could just be me....

 

Best turn the power of first

[TheBinMan]

If its 15mm copper is suspect its a Central heating boiler overflow or blow out. If the boiler overheats or becomes too pressurised it can release hot water/ steam through it.they usually point down to stop them spraying everywhere.