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Air Compressor Tank - Leaking Drain

It sounds like you're dealing with a tricky situation with that drain fitting. From your description, it seems like the fitting might be a soldered or brazed connection rather than a threaded one, which would explain why it spins freely without coming loose. Tapping out the bung to a larger NPT thread could indeed be risky if the bung isn't robust enough to handle it. Before proceeding, I'd recommend trying to get a visual with some pictures, as that would really help in understanding the best way forward without risking damage to the tank. If you're still unsure, consulting with a professional or someone experienced in compressor repairs might be a good next step to ensure everything is done safely and correctly.
 








 
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