Homemade Air Manifold
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 I made this air manifold for air distribution. It has several
isolated "compartments": 
  - Regulated pressure compressed air -- 9 holes
- Dry (dried) air - 4 holes 
- Lubricated air - 4 holes 
- Vacuum - 4 holes 
 The brass piece is 1 1/4" in diameter, 10 inches long. The cost is
$7 plus modest shipping (eBay). This manifold is mounted next to my Curtis Compressor. The valve pointing downwards is connected to a rubber hose that connects to basement compressed air plumbing. 
  
(Click on the thumbnail images to enlarge)
 