Used smog hose. Connects the check valve to the air cleaner. 1967 Mercury Cougar and 1967 Ford Mustang with C and A code 289 engines, and typical California Thermactor smog system. Hose only, no clamps included. Hose is curved as shown, maybe 9 inches long. Inside diameter is 3/4 inch. Can be used with or without clamps, we have found them with a clamp to the valve, and without. Generally no clamp on the air cleaner end.
Ford part number C7ZE-9H569-A.