Stainless Steel Vent Cover (Clamshell Vent), AISI 316 – sizes 45x40 mm / 55x63 mm

Keep your boat’s ventilation openings dry and functional with this stainless steel vent cover, also known as a clamshell vent. Fabricated from AISI 316 marine-grade stainless steel, it offers excellent resistance to rust and corrosion, making it ideal for the harsh marine environment. The sleek, polished finish not only complements your boat’s aesthetics but also reduces wind drag. Its clamshell shape effectively deflects water, preventing rain or spray from entering the vent while still allowing air to flow freely.

We offer this vent cover in two convenient sizes to match common ventilation cutouts. The small size (45 x 40 mm) is perfect for compact openings such as those for electrical cable pass-throughs, small compartments, or bilge vents on smaller boats. The larger size (55 x 63 mm) provides more coverage and is suited for standard vent holes on bigger boats or areas requiring more airflow. Both sizes feature a curved, dome-like profile (the “clamshell”) that protrudes only slightly from the surface, minimizing tripping hazards or snag points on deck.

Each vent cover is easy to install over an existing hull or deck opening. It can be secured with screws using the pre-drilled holes in its flange (or you can drill as needed). For a watertight fit, apply a marine-grade sealant under the flange during installation. Once mounted, the vent cover channels water away from the opening underneath, protecting interior spaces or equipment from water ingress during rough seas or heavy rain.

Use these vent covers to safeguard any ventilation or drainage holes on your boat – for example, fuel tank vents, locker breathers, engine compartment ventilation openings, or even electrical cable outlets. The use of AISI 316 stainless steel guarantees longevity and a maintenance-free shine. They are recommended for any vessel where maintaining airflow is crucial without compromising on keeping water out. These vent covers are especially popular on sailboats, cruisers, and fishing boats where reliability and durability are a must. Choose the size that best fits your needs and enjoy improved ventilation protection.