I am looking to install an ice maker box for my fridge. The last owners just ran a poly tube up through the floor and I would like to do it correctly. I was looking at the Oatey I2K boxes and was debating between the solder or the pex connections. I have soldered before and feel comfortable doing it but had a question about doing it properly. On the bottom of the valve there is a threaded fitting. Obviously you solder a female threaded fitting to a 1/2" copper pipe. But are you soldering the female fitting to the valve as well (after screwing it on)? Or do you just tape the threads and connect it? I ask because people talk about melting the box while soldering. If you are not soldering the threads I guess I don't understand why you would solder with the box attached. I would prefer the pex but the solder box is cheaper and I have access to tools to solder. Thanks for the knowledge.