I need to take apart my water seperator

[Tydb]

I need to take apart my water seperator on a 08 6.4l powerstroke . I just bought the truck with 82k miles on it and i tryed to drain my water seperator and it just drips out . Dealership wants 400 to replace a gasket and at the most a sencor . I think im pretty capable of doing it my self but i cant get any info on what all needs to come off to clean it . And whats the allen size for the screws .Any help would be much appreciated

[Axis2011KR]

You might have better luck in the 6.4 section bud. Hopefully a mod can move the thread.