If you have to put something over one of the holes, better the ball valve rather than the sight glass and thermo. You can put a piece of silicone tubing over the ball valve handle to make it more heat tolerant.
Sight glass ports go as low as possible, as does the bulkhead. The thermo should go an inch or two above those but certainly not above the centerline of the keg unless you ALWAYS plan to have more than 8 gallons in there.
Are you welding couplings in?
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!New Stuff?