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Old 04-19-2016, 06:56 AM   #11
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okay.
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Old 04-19-2016, 09:56 PM   #12
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The anode is a NPT (National Pipe Thread) which is a tapered thread. If you look closely at the thread, the diameter is smaller at the inside end then at the cap end. The female end is the same

A NPT thread works by wedging the threads together. You should never try to get the cap to thread all the way in - that will damage the thread and/or the plug and female part.

The proper way to insert the anode is to put two to three wraps of Teflon thread sealer, or a layer of pipe dope, on the male threads, insert the anode rod and tighten by hand. Then, using a 1-1/16" socket and ratchet or a breaker bar, tighten between 1/4 an 3/4 turns. Then fill and pressurize the water heater. If it doesn't leak, you're done. If it does leak, tighten slowely until it stops leaking. For long life of the threads and fittings, you want the plug just tight enough to seal the joint - anything more can lead to damage.

As far as the anode rod blowing out, if you have one or two turns initially the anode rod will not blow out at the pressures seen in an RV!

(I've been doing industrial piping for many years, with threaded fittings upto 4" - I know what I'm talking about.)

Rick
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Old 04-19-2016, 10:29 PM   #13
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Good explanation, I wish I knew this a few days ago. I don't recall how much of a turn I made with the wrench but I know I was trying to be conservative in my efforts.

I will print out your explanation and save it, maybe laminate it for storage in the heater compartment.

Thanks.

Bobby
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Old 04-20-2016, 06:21 AM   #14
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I just flushed mine and installed a new rod it only takes a few turns like 3-4 and then its tight and you will have more threads showing so don't worry about it, it wont become a rocket
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Old 04-20-2016, 08:49 AM   #15
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Quote:
Originally Posted by OldCoot View Post
Me thinks you are worrying about something that doesn't need to be worried about. Use Teflon tape or pipe dope and it won't rust as much. Regardless ,quit worrying about it.
X2 OC !!!
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Old 04-22-2016, 12:04 AM   #16
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Technically, neither Teflon tape or pipe dope are thread sealers, but merely thread lubricants. Both products are fine for the anode rod install, as they make it much easier to thread the rod into the tank. Pipe dope is probably the best of the two, as it has solvents that evaporate and allow the dope to harden, making it a better sealant. Teflon does not adhere to the threads when one installs the rod into the tank, thereby providing no sealing capability. Just my professional opinion. (Retired plumber.)
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Old 04-22-2016, 05:23 AM   #17
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Technically, neither Teflon tape or pipe dope are thread sealers, but merely thread lubricants. Both products are fine for the anode rod install, as they make it much easier to thread the rod into the tank. Pipe dope is probably the best of the two, as it has solvents that evaporate and allow the dope to harden, making it a better sealant. Teflon does not adhere to the threads when one installs the rod into the tank, thereby providing no sealing capability. Just my professional opinion. (Retired plumber.)
Question if it has no sealing capability then what is it its use by millions of people in water and gas lines ? I have even read many places that say to use it even in my new house I had built the heating guy and the plumber used it on all connections propane and water so I should have them come back and change it, just asking a question not saying your wrong
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Old 04-22-2016, 06:29 AM   #18
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Question if it has no sealing capability then what is it its use by millions of people in water and gas lines ? I have even read many places that say to use it even in my new house I had built the heating guy and the plumber used it on all connections propane and water so I should have them come back and change it, just asking a question not saying your wrong
You are correct, Thread Seal Tape is listed as such,but Yellow is for Gas line use,white for general plumbing! Youroo!!
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Old 04-22-2016, 06:35 AM   #19
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Originally Posted by checkmate99 View Post
Technically, neither Teflon tape or pipe dope are thread sealers, but merely thread lubricants. Both products are fine for the anode rod install, as they make it much easier to thread the rod into the tank. Pipe dope is probably the best of the two, as it has solvents that evaporate and allow the dope to harden, making it a better sealant. Teflon does not adhere to the threads when one installs the rod into the tank, thereby providing no sealing capability. Just my professional opinion. (Retired plumber.)
See? This guy knows what he's talking about. If you HAVE TO use Teflon tape or pipe dope to seal a NPT thread, there is a problem with your threads. Using Teflon and pipe dope is standard practice in plumbing to make things go together easier, but I have run across cases where bad threads were "hidden" by copious amounts of dope and/or tape. The joint may appear to seal today, but sometime from the day of installation to fifty years later, that joint is going to leak and I will usually be rewarded with a time-consuming job of taking apart an entire gas pipe system or heat system just to get to that one bad joint that was "hidden" by tape and/or dope by a lazy plumber. You should never try to use Teflon tape, pipe dope or a combination of the two on a leaking NPT thread.

I use no tape or dope on my anode rod.

Bruce
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Old 04-22-2016, 06:51 AM   #20
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On a Metal to Metal connection that Will be removed Many times in its Lifetime such as a A-Rod,USE Teflon Tape for a Good Seal and Lubricant! A Tapped pipe thread and a Die Cut pipe are a VERY "Pitted/Uneven" surface to Try to Seal! I have also laid a Lot of Pipe! Youroo!!
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