Product Details: The Velvac Fuel Cap is the perfect choice for vehicles equipped with properly vented fuel systems. This premium-quality fuel cap is constructed with durable brass for long-term use. The patented Loc-Gard on the locking cap helps protect against moisture and contaminants. With its non-vented design, this fuel cap is designed for use only on vehicles equipped with properly vented fuel systems. FleetPride is your First Click in Heavy Duty®.