It depends on the diameter of your chiller. Most folks that have a drain bulkhead on their kettles use a counterflow chiller so it's not an issue. Another alternative is to get a thermo with only a 2" stem only your readings will not be as accurate.
I'm selling a chiller 11" diameter which would be fine for you if your pot is 15" diameter or more.
Sightglass, Refractometer, Ball Valve, Weldless bulkhead, Thermometer, Decals, Stainless Steel Fittings, Compression Fittings, Camlock Quick Disconnects, Scale, RIMS tube, Plate Chiller, Chugger Pump, Super Clear Silicone Tubing, and more!