FWIW, When you order the tank be sure to tell Ronco you want the fittings to be flush with the outside...their standard fittings installation puts a nipple on the outside of the tank that's about 1/2" high. And include the "collar" on the threaded tank fitting in the space needed above the tank. A 1.5" 90 typically needs at least 5" above the tank...it looks like a little less for the SeaLand fitting. I'd buy the fitting before ordering the tank if I were you, so you can measure the space needed above the tank yourself.