help with shallow well pump drain plug


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Old 05-17-22, 04:15 PM
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help with shallow well pump drain plug

I have an older shallow well pump that i winterize every year. Part of the area where the drain plug screws in has rusted off so I attempted to install a needle valve so i wouldn't have to remove it every year. But while screwing in the needle valve it started going sideways so maybe the threads were not the same as the plug. The drain plug would not screw in nicely afterwards but I was finally able to get it to go in a bit but still not as far as i would like.

Should try to use a tap to clean up the threads or is replacing the pump the better option?


 
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Old 05-17-22, 04:45 PM
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You could chase the threads with a tap. Should be plenty of meat there in the casting.

I believe the drain plug is 1/4" NPT/MIP so that fitting should work.
I prefer a short nipple and a cap.

 
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Old 05-17-22, 05:16 PM
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What's the advantage of the short nipple and cap vs the needle valve?
 
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Old 05-18-22, 06:09 AM
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A simple plug is the cheapest and most reliable. A needle valve can work but it's more expensive and complex (seals that can leak) but it can work as long as it doesn't clog. There is also the possibility of corrosion. A steel plug and steel pump housing are very similar so there is minimal galvanic corrosion. Brass, while not bad is a different metal and could cause slightly more corrosion. The good thing is the brass won't rust in place like a steel plug. I would chase the threads in the housing with a tap (make sure you get an NPT, not straight threads) and use your plug.
 
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Old 05-18-22, 06:30 AM
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Sounds good! Thank you for the help!
 
 

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