Take two measurements...
The inside diameter of the threaded fitting...which, on 2004 vessel, is most likely 1.25" (1.5" only refers to the size of the hose that fits).
Count the threads per inch (tpi)...that's most likely 11.5.
Armed with those two numbers, you should be able to select the right one....and btw, it's Noz-All, not NOX ALL...most likely Dometic/SeaLand #310343503.
Do NOT just take my word for that...a "most likely" number is not a guaranteed number. Take the measurements yourself!