I like the idea of this product to be able to control my mash temperature, however, I am extremely disappointed in the quality control of this product. Each of the welded nipples differs in its ability to thread on appropriate fittings with the worst one being the bottom nipple. Even repeated application of teflon tape is unable to provide leak tightness so that there is a constant slow leak rendering this product non-usable. Cannot get even a single full turn of the nipple threaded onto the welded fitting. These nipples were clearly welded after they were threaded so that the diameter of the threading actually pinches at the weld seam. Too much heat applied during welding with no heat sinking. Simply testing each nipple would have discovered this issue.