If you're going welded with a CFC or plate chiller and want the ability to whirlpool with a pump, and you also want pickup tubes here's what I would recommend. Punch 3/4" holes at the top and bottom, buy full couplers, and have your welder weld them half way through the kettle wall. Then you can screw your ball valve/camlock/etc in the front, and pickup tube/whirlpooling fitting in the back. I bought half couplers not realizing they aren't threaded all the way through, tried to tap them out, broke a tap off in one of them, then ended up cutting all of them off and starting over. Huge pain in the @$$. I am taking BK and HLT back to have the above done so I can recirculate strike water and sparge water for even temps, and recirculate BK during chilling, and also use pickup tubes, I think this helps minimize the number of fittings you have to install on each kettle.