Heavy Duty Coolant Reservoir Cap And Radiator Overflow Tank Lid Oem 21712 79900 Straight Swap For Infiniti Nissan Renault Two Pack Built Tough To Handle High Heat Without Breaking A Sweat

Premium Heavy Duty Coolant Reservoir Caps For Nissan Cars
✔️ Fits Infiniti Renault OEM 2171279900, Pack Of 2 Black Caps

This two piece coolant reservoir cap set replaces worn radiator overflow tank lids on daily driver sedans and trucks. Mechanics install these seals onto antifreeze expansion chambers to maintain steady system pressure and prevent fluid loss during highway driving or steep mountain climbs.

✅ Direct replacement for part number 21712 79900
✅ Outer diameter measures one point five inches
✅ Internal seat fits one point two inches securely
✅ Pack contains two durable black reservoir caps

💡 Why do aftermarket radiator overflow caps fail sooner than factory parts?
Standard plastic seals crack under repeated heating cycles.
- Reinforced thermoplastics hold pressure during aggressive towing runs.
- Precise inner diameters lock tight against corroded tank necks.
- Swapping old caps with fresh ones stops nasty antifreeze drips fast.

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