Buy yourself a 2-inch bulkhead fitting with a snap-on or screw on gasketed cap. Get the appropriate sized hole saw and drill a hole in the top of your tank, install the bulkhead fitting, which is easy enough to do, and you have a hole to pour your sanitizer, or Chlorox, in. Other than that, what I did at first was take a hand pump similar to the winterizing pump, shift the tank over to fill, and pump in the proper amount of solution. I then added enough water to fill the tank about halfway, drove around a bit, pump water through my lines and into the grey water tank until the fresh water tank was empty, and then rinsed it out with clean water until, using a tropical fish test kit, I no longer detected chlorine. Done.
Patti and Jack, our GSD "Gunner the Wonder Dog," and our various cats.
Rookies Plus Three Years. 1998 6330 National Tropi-Cal 460 Ford, full Banks kit, Trans-Command, full internal and external makeover and lots of suspension upgrades.