radiator copper stainless

The bottom of my radiator has eroded and water keeps coming out and it’s leaking into downstairs, it’s the copper pipe that connects the radiator and goes under the floor boards. Is there any way I can stop the water coming out of it just for tonight until a plumber can come out in the morning

Hi I need to add another radiator at the top of my system. I just checked the feed and return pipes are not copper. They are a mucky grey/silver colour (stainless?) I want to add T-Pieces to these, and some copper pipe off to another radiator. Am I right in thinking these are likely to be...