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Old 08-07-2014, 12:02 PM   #11
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Add me to the brass plug list.
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Old 08-07-2014, 12:44 PM   #12
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The Atwoods are aluminum and I would worry about dissimilar metals causing a galvanic reaction and corrosion.
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Old 08-07-2014, 02:41 PM   #13
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Brass and aluminum will not have a reaction with each other, I had one of these brass plugs on a trailer that we had for 6 years and I never had any corrosion.
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Old 08-07-2014, 02:47 PM   #14
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I have a Low Point Drain that appears to drain my water heater. Guess I'll have to pull the plug to confirm...
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Old 08-07-2014, 03:04 PM   #15
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FWIW, our 23B had a 15/16 that I recently replaced with a 7/8. I already had a socket set with a swivel and some extensions, so I just bought a $3 7/8 socket head to fit the drain plug. I was getting tired of using the pliers and adjustable wrenches, since the nice sheet metal pieces of the water heater loved carving up my hand every time the tools slipped...
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Old 08-07-2014, 03:24 PM   #16
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I put a couple of wraps of Teflon tape on the threads of the nylon plug and install it finger tight. No leaks and it'll come right out in the fall.
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Old 08-07-2014, 03:30 PM   #17
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X2 with Crabman's 15/16"

I replaced it with a reduced pipe nipple and added a short hose fitting for a bathroom sink and put a 1/4 turn valve at the end of that tube. Don't have a piture right now, but I hated to take the oem plug in and out as there was no room. It is now extremely easy to drain the tank.
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Old 08-07-2014, 03:57 PM   #18
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I have to concur with the assessment that brass and aluminum are dissimilar metals and do not like each other. Have seen brass eat right through aluminum on boats. Now if there is pipe thread tape separating the brass valve from the aluminum tank, there may not be a corrosion issue. Not sure.....
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Old 08-07-2014, 08:55 PM   #19
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Quote:
Originally Posted by Crabman View Post
I have to concur with the assessment that brass and aluminum are dissimilar metals and do not like each other. Have seen brass eat right through aluminum on boats. Now if there is pipe thread tape separating the brass valve from the aluminum tank, there may not be a corrosion issue. Not sure.....

We have had a total of 9 trailers, I have used the brass drain plug in all of them and never had any, not even one spot of corrosion, I just put one in our new trailer.
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Old 08-07-2014, 10:43 PM   #20
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Some time back, a RVer at another form, showed where he drilled a slightly small hole threw the center his Nylon water plugs, then screwed one of these valves (shown above) into that factory plug. Hardwares stores have the same plugs in a plastic form.
I copied his advice, and made a couple, but on one it had a slight leak so I unscrewed it and applied some epoxy to it's thread, then threaded it back in where the threads were already cut. It has worked fine for 7 years now, But I do remove that plug, valve and all using a deep well socket, when I drain the tank in the winter. No dis-similar metal reaction questions at all, but I do make sure the card says, "Solid brass", none of this plated stuff on that valve.
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