Question, just had to replace a water stop under toilet and had to take off valve step after removing nut at handle to drain out water so to heat up the existing solder connection, I have a new brasscraft sweat quarter turn to install, however, I am concerned because this valve has no nut to take off handle if I ever need to replace it and get water out of the line. There is a screw in the middle of the handle but I can't budge it so am not sure I want to install this in the line. What do you think.

I would suggest using a new compression stop. You can get them in the 1/4 turn also. The 1/4 turn ball stops I have seen, do not have a packing nut, so you can't dissasemble them.

Thanks, I was able to get the handle off and looks like you are right, no way to get stem out of the valve. So if I want to go with the quarter turn sweat on valves, how would I remove water from the line if I ever need to replace this valve, or do you just suggest never using these for this reasons, thanks.

You could suck the water out, then boil the rest out with your torch, or you can open a fixture lower than the toilet stop to drain water out of stop, or just cut the stop in half with a sawzall to drain water. I never personally use sweat valves, just easier to use compression valves. I don't know of to many plumbers that use sweat valves anymore. Compression is pretty standard anymore.

Thanks again, I actually got a call from brasscraft after I posted this question and they confirmed that their quarter turn valves , you cannot take out stem. Thanks for the tips about boiling, sucking and/or cutting the valve, would cutting it risk breaking the pipe, seems quite violent. I have lines that seem to be pitched toward the valve so the problem. I personally have been doing diy stuff for a lot of people and always liked to sweat the valves. Old fashioned view, I guess.