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It is the vent for the gas tank, the charcoal in the canister absorbs the fumes while the gastank vents air out. It goes in the back of the cab above the rear window, it's between the inner and outer roof. I think this started to be used in 71-72.
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RJD
1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 350/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 478M V6/5 spd winch truck
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