Anyone know where I could be able to get some dry wells around 3' that I could use to read the bottom temp of my propane tank thermal storage? The only ones I can find are the Honeywell 3". Or if anyone knows how to make one this size.... I am having trouble finding a 3/4" male thread with a 1/2" sweat fitting on it that would allow me to screw into the 3/4" ports I have on the top of my tank.