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| Feature | Specification |
| Primary Part Number | MOTORCRAFT RS-7 |
| OEM Part Number | A1TZ-8100-A (Ford/Motorcraft) |
| Function | Radiator Pressure Cap (Low Pressure for Open Cooling System) |
| Pressure Rating | 4 PSI (Pounds per Square Inch) |
| Cap Type | "B" Size Filler Neck (Standard Low-Pressure Size) |
| Attachment Type | Cam On (Non-twist/Leverless style) |
| Material | Stainless Steel/Silver Finish with Rubber Seal |
| Typical Use | Original Equipment (OE) Cap for early Ford and Truck Radiators. |
| Vehicle/Truck | Years | Engine Type | Notes |
| Ford Passenger Cars | 1949 - 1951 | Flathead V8, I6 L-Head | Used on the primary radiator (pre-pressurized system). |
| Ford F-Series Trucks | 1948 - 1952 | Flathead V8, I6 L-Head | Used on F-1, F-2, F-3, F-4, F-5 trucks. |
| Mercury Passenger Cars | 1949 - 1951 | Flathead V8 | Used on early Mercury models. |
| Jaguar XK140 | All Years | 3.4L 210cid L6 | Confirmed fitment on this vintage foreign model (indicating international usage). |
| Ford Passenger Cars | 1950 | 3.9L 239 Cu. In. V8 | Confirmed specific fitment. |
