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Porsche ATF Reservoir Cap Seal – Automatic Transmission Filler Neck Seal
High-quality replacement seal for the automatic transmission fluid (ATF) reservoir cap.
This seal fits the screw cap of the transmission filler
neck, ensuring a secure and leak-free seal to maintain proper fluid containment
and system integrity.
Fits:
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram ref no 9
Manufactured to OEM specifications, this component is essential for preventing fluid leaks, maintaining correct pressure, and ensuring reliable transmission performance.
Key Features
• Direct replacement ATF reservoir cap seal
• Designed for automatic transmission filler neck
• OEM-style fit and function
• Helps prevent fluid leaks and contamination
• Durable material for long-term performance
• Essential maintenance component
Function and Purpose
The ATF cap seal ensures a tight seal between the filler neck and cap, helping to maintain proper transmission operation.
It helps to:
• Prevent transmission fluid leaks
• Maintain system pressure and cleanliness
• Protect against dirt and contamination
• Support long-term gearbox reliability
Why Replace Your ATF Cap Seal
Over time, seals can degrade due to heat, fluid exposure, and age.
Common issues include:
• Fluid leaks around the filler cap
• Hardened or cracked seal material
• Loss of sealing performance
• Contamination risk
Replacing the seal ensures continued reliability and proper transmission function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
477321483A
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95

