A guy on the other site suggested that I use the
ball valve before the union. This way I can shut the valve "before" I took the pipe off. Makes sence to me. The way I have it above is bad. In the above senerio, even if I shut the valve off, the water would shoot all over the place as the union is before the shut off. This could have been messy. It was also suggested that I may wanna go with a dual
union ball valve, but I'm still trying to figure out what it is and how to apply it to this senerio.