1948 Cessna 120

That's correct, just a different style. That's how mine looks. This is not mine, but here's one listed on Ebay that is like mine. You can see the drain valve would be on the bottom.
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Looks like a tractor part that they just drilled and tapped a new hole in to drain with.
 
Looks like a tractor part that they just drilled and tapped a new hole in to drain with.
It actually IS a tractor part. This came up once or twice on the 170 Association board. You can find replacement glass bowls at TSC.
 
It actually IS a tractor part. This came up once or twice on the 170 Association board. You can find replacement glass bowls at TSC.

Actually no it is not a tractor part, and yes it does take the same glass.
The difference is, the aviation style has a stand pipe inside the coalescing screen.
And OBTW only a very few early 48 170s had this type of gascolator
 
The difference is, the aviation style has a stand pipe inside the coalescing screen
I believe you are right. The glass dome is apparently interchangeable, but when I needed a replacement for the metal base, I had to get it from a 140.
 
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