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Old 02-01-2011, 04:55 AM   #1
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My water heater's plastic drain plug was leaking. I took it out and teflon taped it. When tightening it back, I twisted it off.
Have not been able to find another plastic one, so I have installed a brass one, with teflon tape and it leaks, so I tried some TFE liquid teflon and it leaks.
I have some plumbers putty, but haven't tried it yet.
We are in southeast Texas and it is really cold and windy today. so I have been holding off
applying the putty.
Any other ideas would be greatly appreciated, because I hate leaks.
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Old 02-01-2011, 06:21 AM   #2
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The plastic plugs are very common. Most RV supply stores carry them in various sizes depending on whether it is an Atwood or Suburban brand. I keep a spare in case your issue arises.
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Old 02-01-2011, 06:32 AM   #3
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Jim, i wouldn't think the plumbers putty will work for that application. I'm just wondering if the internal threads on the tank may have a bad thread. When the weather conditions allow, it might be best if you take out the plug and inspect the threads on the brass plug and also the threads in the tank. I have ran into this problem before. If it is the threads, you may want to get a pipe tap. It's going to be a 3/4"NPT tap. The tank threads may just need to be "dressed" a little bit. Then just apply the teflon tape back on the plug

I hope this helps.
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Old 02-01-2011, 06:33 AM   #4
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Ditto. One of the easiest accessories to find in an RV supply department. I almost always have a spare on hand.
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Old 02-01-2011, 09:32 AM   #5
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dont pick up PVC...its a nylon plug. PVC wont handle the high temps.
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Old 02-01-2011, 09:52 AM   #6
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Thanks Guy's Jim

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Old 02-01-2011, 10:08 AM   #7
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Just to add, don't use plumbers putty - wrong application. Use teflon tape or pipe sealant. When using tape, most people do not wrap enough. On a 1/2" or 3/4" pipe thread you should use at least 8-10 wraps. Also, get another nylon plug or use brass. Don't use galvanized with an aluminum tank. I screwed in a small brass boiler drain valve. Makes it easier to drain as you don't have to take any plugs out.

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Old 02-02-2011, 01:32 AM   #8
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Quote:
Originally Posted by Stan
When using tape, most people do not wrap enough. On a 1/2" or 3/4" pipe thread you should use at least 8-10 wraps.






Tape manufacturers say 2 layers are enough. See here: http://www.acmehowto.com/howto/homemaintenance/plumbing/general/teflon.php



Just wrap the end a couple of times then overlap about 1/2 width the rest of the way.



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Old 02-02-2011, 09:35 AM   #9
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I did not see in the article to only use two wraps. Ask any plumber and they will say to wrap till the tape rounds over the threads when pulled tight. This is normally 8-10 wraps. Also, it takes more tape for a non-torqued connection than a connection you really tighten down like iron pipe water lines or gas lines.

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Old 02-02-2011, 09:50 AM   #10
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If you used teflon tape and the liquid thread sealant (which should seal even if the threads on the tank are buggered). You might try taking your brush for your TFE and scrape a little bead off all around the lip inside the tank since you are running the threads up into your tank. That way when you thread the plug up into the tank it will pick up the TFE inside also . The heat should allow it to settle back down around the opening making a little more sealed. Make sure the inside of tank is dry and your plug it will pick up the TFE better dry. maybe allow it to set for some time before you refill the tank?
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