Can anybody I.D. this breather tube and cap. I bought this at a swap a couple of years ago because I had never seen anything like it before. It was on a SBC 4BL manifold of no notible significance. The seller thought it came from some sort of industrial application. Never came across another one. Lots of chevy guys ask where it came from or where to get one. Numbers on the tube are 6030 and is cast aluminum. Breather is inner and outer seamed steel. Any ideas?
