This bukhead is weldless desing, allows you to add a TC port to any vessel - no need welding or soldering. Just drill a 41mm hole. Instead of an internal locknut, this hex fitting with its own 1.5"TC flange on it. When tightened together through a hole in the pot/tank, you will leave with 1.5"TC flanges inside an out so you can add your spray ball, sparge arm or whatever else you want. We recommend our 41mm holesaw for installing this to your kettle.