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1972 911 hose from airbox

Fuel System

Vehicle Information: Model: T; Year: 1972; Body Type: Coupe; Engine (type, size, modifications): 1976 S; Total Mileage: Unknown;

At the front of the engine, hanging next to the starter, is a 3/4" diameter 4" long plastic tube with a rubber self-closing gland at the bottom. The top has an 8 mm connection to the CIS. Is this a factory attempt to build in a pop-off valve? If not, what is it? Thank you.

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