The "advertising" on the package that my magnesium anode rod came it specifically states that it's for Atwood aluminum RV water heaters.
I wonder why an aluminum tank does not require a magnesium anode rod ... what's the metallurgical chemistry that makes this so?
I figure that a finger-twist 1/4" pet c o c k drain is more convenient to use for periodic draining and flushing (due to salt build-up in the tank from high particulate content count, but otherwise safe, potable water) than getting out a wrench or socket and handle to unscrew a hard-to-reach nylon drain plug.