This is picture of my under the sink shuttoff valve for sink supply line. I need to replace valve. I have few questions.
1) what kind of valve should I choose ? Sweat joint,compression or push to connect.
2) I will need to cut stem pipe first to remove oldvlave, that is going to reduce the length of it. I wonder what happens when I (or someone else) need to replace valve again after 30 years , after cutting valve, pipe won't be long enough for new valve. Any way to extend pipe today so that I will have enough pipe length to replace valve next time ? You may say I should leave it to whoever is going to deal with that problem in future and not worry about that today, but I am just asking out of curiosity, Is there a better way ?