The 622 comes with the Seperator included, however it will only work if you have a DishPro PLUS LNB or DishPro Plus Switch.
DO NOT USE IT IF YOU DO NOT HAVE A DISHPRO PLUS SETUP, if you try you could damage your 622.
DO NOT USE IT IF YOU DO NOT HAVE A DISHPRO PLUS SETUP, if you try you could damage your 622.