I was going to shut off the angle stop valve (shown in figure a) but it did not budge. I tried every possible method but it did not work so I decided to replace the whole valve. I could successfully take out the valve (which is shown in figure c) but ran into several problems
a) First of all, what is the type of this angle stop? Is it compression type or threaded type? The nut and the yellow ring (indicated by the blue arrows in figure b) could not be taken out. The pipe is smooth and does not have any thread. The threads are inside the nut. I was wondering whether I should buy the thread type and connect it to the nut or whether I have to take out the nut and the ring and connect the compression type to the pipe.
b) Because I was not sure about type of the valve, I decided to put the old valve back but now have leak around the connecting nut (indicated by red arrows in figure a). What should I do to make the leak stop? Or, is there any way to cap the end of the pipe ?
Thanks a lot in advance!