I welded up 2 one for my buddy, we installed his but he does not use his compressor that much.
Mine still needs to be installed but there are many on the web that use them.
hav fun
Tom
Printed (37", 2" pipe, 19" high make sure inlet points down) the short version from Franz. If bored this weekend, might build it. Then the installing it part comes in. His explanation of how it works sound solid.