Deck fillers are marine fittings designed for safely filling fuel, water, or waste tanks on boats. They feature lockable caps to prevent contamination, leaks, and spills, ensuring a reliable seal. Essential for maintaining system efficiency, deck fillers help protect the environment and comply with safety regulations. HIDEA deck fillers are crafted from premium 304 or 316 stainless steel, using advanced investment casting for precision and reliability. Designed for both recreational and commercial marine applications, their mirror-finished surface enhances aesthetic appeal while providing superior resistance to wear, corrosion, and environmental factors.