Bruce Smith wrote:

The valve casing I have is Precision Scale 31005. That is listed in their catalog as a "tank car dome", but it is clearly a casing or "hood" and not a dome.

Thank you, Bruce. I'll have to get one and have a look. I've heard previously that such a part existed from Precision, but haven't ever seen one as far as I know. Is it like a typical ICC 105 casing or something less common?

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