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Old 03-18-2013, 10:26 PM   #11
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As said above, the anode rod is NPT which means National Pipe Thread, which is a tapered thread. If you look closely at the anode rod you will see that the plug diameter increases in diameter as you travel towards the head. NPT forms a seal by deforming the threads as you tighten the plug. The reason that either pipe dope or Teflon tape is needed is to assist in sealing the gaps between the threads.

When you put the anode rod back in, make sure the threads are clean on the rod and in the tank (use a wire brush to clean them), then use about three or four wraps of Teflon pipe tape or a thin layer of Teflon based pipe dope.

When you tighten the anode rod, don't over do it. Go finger tight plus one half turn. Fill the system and put it under pressure. If it leaks, tighten a quarter turn at a time untill it stops leaking.

One of the biggest mistakes people make with pipe threads is over tightening the joint.
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Old 03-18-2013, 10:29 PM   #12
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I concur. I looks just like mine with a few threads sticking out.
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Old 03-18-2013, 10:36 PM   #13
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when I winterize my hot water tank I took the anode rod out and run the hose thru it because it a had a lot of settlement in it then I think I put it back in was i suppose to that
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Old 03-18-2013, 10:38 PM   #14
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Why didn't somebody tell me that last month?! About the pipe threads! Just because I didn't ask is no excuse.
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Old 03-18-2013, 10:58 PM   #15
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Quote:
Originally Posted by arjerram View Post
Why didn't somebody tell me that last month?! About the pipe threads! Just because I didn't ask is no excuse.
3/4 NPT! Hows that. Youroo!!
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Old 03-18-2013, 11:22 PM   #16
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it is nice to put some Teflon tape on those threads

makes it easy to remove later




a while back my blow out plug was leaking on our RV heater

man oh man was that thing in there tight also

bent a wrench getting it out


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Old 03-18-2013, 11:55 PM   #17
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I pulled mine the other day. Trailer is a 2012, put in service Sept of 12. The anode rod has SERIOUS erosion near the nut end of the unit. Normal?
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Old 03-19-2013, 12:01 AM   #18
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I soaked mine in vinegar to clean it, then gently, wire brushed it
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Old 03-19-2013, 08:46 AM   #19
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Mine shows about half the threads when it's very tight.
Some will go in more than others.

That corrosion you see is because it's a sacrificial anode.
It's corroding 1st rather than your tank.
It's supposed to be slowly eaten away.
Once it's 3/4 eaten away you can replace it.
I know others here have various opinions about how often to replace it
but as long as there is 25% of it left, it's doing it's job.

See this thread post 2 for great photo's of the various stages of anode life.
Hot water heater anode
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