Exhaust Juice Tank question

[lotsofmiles]

Ive been noticing that the Diesel Exhaust Juice tanks might make a nice water/meth tank.

Looked it up on parts direct. Couldnt find a pic for the truck, but did see a pic for the van.

Is this right? Emmisions reduction system tank, msrp $1228, your price $728.
ouch

 

[Mike L.]

That's a lot of money for a tank.

 

[JD4440]

I guess that's all of #1 ? That's a big hole in top to close if not using the pump