snorkel box
n.— «The boy…had been swinging on the long chute of a type of mailbox known as a “snorkel box.” The 160-pound mailbox features a regular pull handle on one side and a long, curbside chute on the other, designed for mail deposited from the window of a car.» —“Mailbox Fatal to Boy, 6, Lacked Bolts” by Amy Goldstein Washington Post Sept. 22, 1988. (source: Double-Tongued Dictionary)
Further reading
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