My Febco 825Y 3/4" is ~15yrs old. At one point it froze and an irrigation company fixed it by brushing solder into the crack. They also did something to additionally seal the relief valve. This year the inlet valve developed a crack and now it's leaking (see attached picture with red circle and X)... maybe it's time to replace this beast. Local companies want ~$625 to provide and install the unit. I can buy a replacement 825Y here or here. What's involved in replacing this? Can I do it myself? I've done simple no-solder plumbing around the house before but it looks like there might be sweating/soldering involved here as I don't see how I can turn the nuts/joints without breaking the solder (unless I just turn the entire unit?). Anyway. I enjoy doing my own work when possible, but not if I'm over my head.