How long does a compressor tank last?
I have a compressor that I bought about 4 years ago. Just last year, I pulled the "drain" plug to let out all the moisture that accumulates in the tank. Was surprised when a lot of rusty water came out.
1st question: How often should I drain it?
2nd question: If it is rusting on the inside, how long do these things generally last?
Thanks.
I guess draining it every two years is bad. 
Am I at risk?
The compressor needs to drain after every use. Tanks should last 20 years
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