Anode Rod

That probably is normal. Mine will make about 2 turns and starts to get snug. make sure you clean threads well with wire brush. wrap Teflon tape around threads on the anode rod about 2 or 3 times (put the tape on clock wise). hand start the anode in. after about 2 turns it will began to tighten. tighten about 1/3 to 1/2 more turn with wrench. Do Not over tighten. turn on water and check for leaks. you'll be ok. just don't over tighten.

The plug is pipe thread.  Pipe thread is tapered so it will run tight and not leak.  As said, add tefflon tape, make tight, check for leaks, camp.

Pipe threads are meant to get tight.
TT

In two seasons mine is half gone.  I would rather have the sacrificial rod melting instead of the heater.  

Originally posted by gappman I pulled mine out and put a drain petcock in its place.

  Not a good idea!  Google anode rod a little bit and find out why water heater manufacturers put these annoying little consumables in their water heaters in the first place.  They aren't necessary in the short run but they have a major impact on the life of your water heater.  Considering that most, if not all, of the opportunity for water heater failure is while you're on the road away from home, the inconvenience of fixing or replacing a water heater probably outweighs the expense, which will be way more than the cost of an anode rod.

  TT