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I have a 1.5 HP two tank compressor that I have to drain daily.

What is the most efficient trap to capture the water oil mixture as I drain it?

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Single plug underneath? If so, I drain my single-tank into a disposable aluminum pie tin (i reuse it, just keep a shop rag on it) after unplugging power, dropping the pressure down to about 20-30 psi internal using my blowgun attachment and letting it sit for a bit, then pour the condensate into an old compressor oil bottle to be dropped off for disposal. If necessary, you can probably fit a temporary plastic hose to act as a drain line if the plug is higher/in an awkward position. Just my 2 cents. – Jacob S Jul 16 '13 at 16:54
Two plugs actually, one for each tank. Thanks for the info. Why don't you drop the internal pressure all the way to zero? – l3win Jul 17 '13 at 18:28
Having air movement helps to force the condensate out. Fun experiment -- fill two cups with ice water and allow to form condensate. Hold one and blow compressed air over it -- then check which of the two cups has more water stuck to the outside. :-) In essence, the air movement helps smaller drops overcome friction -- but all in all, it is a personal preference. Lowering the pressure just decreases the amount of blowing around the water does in the tin. – Jacob S Jul 17 '13 at 18:59

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