So there's no dome on this right? You may want to think about a bunch of standoffs which can be stainless machine screws with double nuts. The head sits on the bottom of the cooler and the double nuts hold the FB at whatever height you like. Whatever fitting you use to attach your tubing, make sure the open end doesn't sit flush to the cooler bottom or it won't flow.
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!