Filler caps and fuel caps seal filling ports in tanks and reservoirs containing liquids or granular media, preventing the entry of foreign substances and ensuring no leakage of fuel or media from the reservoirs. These caps are especially vital for containers holding combustible materials and are commonly found in various vehicle reservoirs and storage units. Different designs offer features like pressure relief and ventilation, with sealing methods including fine and coarse threads, quarter-turn connections, and hinged radial or face seals. Some specific types of filler caps and fuel caps include oil fill caps, gas caps, radiator caps, tank caps, diesel caps, hydraulic caps, race caps, and flush-mount caps. Browse through our collection of filler caps and contact us for special requests.