There were two different vents used.
Please see attached GM Service Information Bulletin B29, Item 64 from December 12,1942
The early one was simply a pipe with a cap on it held on by a cotter pin "Fig2". The second version was the air cleaner type "Fig2".
These were introduced into production starting at serial number 1844332070.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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