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Old 05-20-2011, 09:19 AM   #1
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Atwood-nylon drain plug

I just sanitized water system. Noticed after removing nylon drain plug twice, the edges for the socket are starting to wear fast. Any advice as to removing it, and installing a Camco brass 1/2" threaded plug (#11703), with a drain valve on it? Looks like they go for around $6. I read on forums of the heads coming off etc. Also read about replacing the 1/2" plug with a CPVC fitting. . .is this better than the nylon plug?
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Old 05-20-2011, 10:48 AM   #2
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I'm still using the same nylon plug as when I bought our trailer 11 years ago. Could you be overtightening it? My procedure is to screw the plug in until it's just snug, not tight, fill and pressurize the water system, then check the plug for any leakage. If leaking (which I prefer to happen), I only tighten it just to the point where the leak stops.

I seem to notice that some folks just put the plug in and then really tighten it down before testing for leakage. This can lead to overtightening, damage to the plug's threads and even the possibility of shearing off the head.

Personally I wouldn't be comfortable substituting a brass plug (or anything else with brass threads) for the nylon; especially since the tank and its threaded drain opening is aluminum. And keep in mind that if you happen to overtighten that brass plug, you could damage the aluminum threads of the tank- then you'd have a real problem on your hands. I don't think damage to the tank threads is as likely to occur with the nylon plug.

I know if, and when, my original nylon plug buys the farm, its successor plug will be another nylon plug.
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Old 05-20-2011, 12:03 PM   #3
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I agree with FPM, brass and aluminum are dissimilar metals that do not like each other and I will stick with the nylon plugs, If you use the correct size socket and an extension they will not round off (I cannot remember the size, 15/16ths rings a bell but not sure).
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Old 05-20-2011, 12:25 PM   #4
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Quote:
Originally Posted by brugreg View Post
I just sanitized water system. Noticed after removing nylon drain plug twice, the edges for the socket are starting to wear fast. Any advice as to removing it, and installing a Camco brass 1/2" threaded plug (#11703), with a drain valve on it? Looks like they go for around $6. I read on forums of the heads coming off etc. Also read about replacing the 1/2" plug with a CPVC fitting. . .is this better than the nylon plug?
Ask yourself would you rather strip a nylon plug or a brass one.. the nylon one will be easier to fix the brass one may do damage to the tank.....there is a reason they put a nylon one in...
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Old 05-20-2011, 02:24 PM   #5
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I just drain the tank with the low point drains... hopefully I'll never remove that plug again.
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Old 05-20-2011, 02:27 PM   #6
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I just drain the tank with the low point drains... hopefully I'll never remove that plug again.

Does that get all the water out of the HW tank?
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Old 05-20-2011, 02:33 PM   #7
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The first time I did it, I pulled the plug after the low points stopped draining. No additional water came out of the hot water heater. Just open the low point drains and then pull the pressure relief valve on the hot water heater. Takes longer to drain, but simpler.
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Old 05-20-2011, 02:47 PM   #8
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I`ll have to give that a try.
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Old 05-20-2011, 02:52 PM   #9
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I agree with FPM, brass and aluminum are dissimilar metals that do not like each other.....snip

I agree as well, may find it hard to get the brass fitting out as time passes. I carry a couple of spare nylon plugs and replace as needed. I also use plumbers tape around the threads (single wrap) so that I don't have to thread the nylon plug in as far (seals better).

The "inside" of the nylon plug is recessed to trap sediment, so removing the plug once in awhile is recommended to clean it or replace it.

Bob
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Old 05-20-2011, 10:39 PM   #10
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I just drain the tank with the low point drains... hopefully I'll never remove that plug again.
I do the same, I never remove the nylon plug. Low point drains get all the water out, just takes a bit longer.
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