Reservoir Caps

Reservoir Caps are replacement caps for coolant, washer-fluid and small fluid reservoirs. They are used to hold fluid inside the reservoir while maintaining the correct vent, seal or pressure behavior. A correctly matched retainer keeps the panel, liner or component in its designed position without crushing the mounting point or damaging the surface around it.

Common applications include Nissan, Infiniti, Chevrolet, Pontiac, Buick, Cadillac and other reservoir applications. Before ordering, confirm the original part number where possible and check cap diameter, bayonet or thread type, seal condition and whether the system is pressurized or unvented. A clip that clicks into place can still be the wrong part if the stem, head or locking depth does not match the original mounting point.

Typical signs that a replacement is needed include a missing cap, a cracked seal, fluid loss or a warning light caused by the wrong cap. When the original number is unreadable, measure the old retainer and compare it with the vehicle, model year and mounting position. For workshop or reseller quantities, confirm the pack size and whether a mixed carton is required.