Thats how ours is-2 handle embedded in each other, pulling the large handel opens both the water valve and dump valve, but you can just pull the smaller handle to add water, though you cant open just the dump valve without water. Our previous rv had single handle-you pulled half way to add water-all the way to dump (while water flowing). old MH had dual foot pedals worked like out current one main pedal opened both water and dump but you could push the small one just for water.
So they are different-Ive not seen one you couldn't add water?