This is the link for the Suburban magnesium anode rod I just received from Amazon. We full time and have NEVER had sulfur smell or any other bad smell from our water heater in the past nine years we have had it. Notice the photo, it comes pre wrapped with Teflon tape on the threads which does not cause the rod to not work and the instructions in the manual says to use Teflon tape on the threads.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
This is copied from the manual:
ANODE PROTECTION
The tank in this water heater is protected by a magnesium or aluminum anode to
prolong the life of the tank by absorbing the corrosive action of hot water. Under
normal use, the anode rod will deteriorate and because of this, we recommend it
be replaced yearly. NOTE: Water with high levels of iron and/or sulfate will
increase the rate of deterioration; therefore, more frequent replacement may be
required. If anode rod is mostly eaten away, replace it with a new one. (See
Figure 11)
To prevent a water leak when replacing the anode rod, a pipe thread sealant
approved for potable water (such as Teflon Tape) must be applied to the threads
of the anode rod. Proper application of a thread sealant will not interfere with the
anode’s tank protection.
Operating the water heater without proper anode protection will decrease tank life and will void your warranty on the tank. NOTE: Tank is drained by removing anode rod (See “Drain and Storage” instructions).
To extend anode life, drain water from tank whenever RV is not being used. Avoid
any extended time of non use with water in tank.