There are many discussions regarding the potential for Galvanic Corrosion with a brass plug screwed into the aluminum tank of an Atwood water heater. There may be a minimal risk of this kind of corrosion with the brass plug, and it may take quite some time to cause any appreciable damage, but why take the chance.
That's why screwing the drain valve into the original nylon plug is more attractive to me, and why I would use the idea from above as opposed to buying the one from CW.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!