Help keep fluid where it belongs with the FEL-PRO Multi-Purpose O-Ring, part number 5511, a Fel-Pro seal listed as both a distributor O-ring and an engine coolant thermostat O-ring. It fits many vehicles, among them the 1975-1996 Ford F-150, 1969-1997 Ford F-250 and 1979-1995 Ford Mustang, as a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list.
Fel-Pro builds its gaskets and seals for real-world repair work, aiming for a dependable seal even on troublesome applications. This O-ring is designed for sealing surfaces that are less than perfect and is made from Fel-Pro's proprietary materials.
- OE-level quality: Fel-Pro rates it to match or surpass original equipment specifications.
- Application-specific design: shaped for a precise fit on the listed applications.
- Made for repairs: engineered and produced specifically for the repair environment.
- Exacting standards: like every Fel-Pro gasket, however small, it comes from Fel-Pro's proprietary design, engineering and manufacturing processes.
An O-ring that has hardened, cracked, flattened or nicked can let fluid seep past the joint it seals. If a worn O-ring is the cause of a leak at that joint, this part replaces it.
Interchange: B9TF12143A · B9TF1214A · D8FZ8590A · 72125 · 764043 · 720005 · 10P2556 · 411040300
This part cross-references / interchanges with the following part numbers:
B9TF12143A, B9TF1214A, D8FZ8590A, 72125, 764043, 720005, 10P2556, 411040300
Frequently Asked Questions
What does the FEL-PRO 5511 O-ring do?
It is a multi-purpose O-ring that seals the joint between mating parts. It is listed as both a distributor O-ring and an engine coolant thermostat O-ring.
Does it fit my 1975-1996 Ford F-150?
Yes, the 1975-1996 Ford F-150 is one of the listed applications. The "Vehicles it fits" section shows every vehicle it fits.
Will it fit a 1969-1997 Ford F-250 or 1979-1995 Ford Mustang?
It is listed for the 1969-1997 Ford F-250 and the 1979-1995 Ford Mustang. The "Vehicles it fits" section shows every vehicle it fits.
What are signs this O-ring may need replacing?
Signs include fluid seepage at the joint it seals, or an old O-ring that is hard, cracked, flattened or nicked. Diagnose the source of the leak before you replace parts.
Any installation tips?
Clean the mating surfaces and check them for damage. Then follow the vehicle service information for installation steps and fastener torque.
