This fits 66-71 Quadrajet with short filter. 7/8 x 20 threads with 1" nut. Fuel fitting threads are 5/8 x 18.
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Had rebuilt carburetor and had a leak at this coupling - it is a double coupling - and since I could not clean this part to get a good seal, I ordered this part - a perfect fit and no more leak ! I would also like to say that the staff were both friendly, patient and helpful in ordering and solving the problem as well.