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Nice job on the auto drain. I’ve used many of them in the field over the years and found that they tend to get gummy and sticky and leak. I end up having to take them apart and clean them and sometimes even have to replace them. I hope yours holds out for a really along time!
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I worked at a Dodge dealership back in the late 80's as a mechanic. When I started working there I noticed that my air tools would be spitting water all the time and I figured it was just time to empty the compressor. I was rather dismayed to find out that the drain had broken a number of years ago, and the shop decided to do nothing about it. Well, I spent good money on my tools, so I thought I would repair the drain valve, using some parts and pieces from our parts bins. When we got the old valve out we found that the compressor must have been half full of water, rust and general nastiness. It took about an hour for it to finally drain out. After that, we decided to have a schedule for the last guy out to drain the compressor. After that things worked so much better.
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Home depot carries an 18 inch long braided stainless steel hose, with the 90 degree elbow on the end, and the valve on the outboard end of the hose, for $18.
Being lazy, I went that route, but replaced the valve on the end of hose with a 90 degree ball valve, easier for my old arthritic hands to operate that way.
Just checked, over the years the hose kit has gone up in price, now $25.98.
https://www.homedepot.com/p/Husky-Ex...023H/205183928
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They all look the same in the pictures, here is the cheapest I found:
https://www.amazon.com/dp/B00QQL2BPY
$4.99 prime