Plug for air filter snorkle and fuel evaporative system “Y”

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Plug for tube in the engine compartment if not using the snorkle hose $5 includes shipping in US. Plastic plug is shown in the side view next to an installed one. I think the snorkle is used to bring warm air to the carbs to prevent freezing. Anyone know if this is true and if so how does heated air get there? Plug has to be lightly filed on the barbs, then tapped in place. A nice tight fit.

The “Y” is from a 1969 and includes the clamps shown and hoses. $25 includes shipping if you do not want the hoses which are extremely stiff.