Sea-Dog 331335-1
Miniature clamshell cover
Low-profile shield for ventilation, wiring or blower-exhaust openings
Sea-Dog Stainless Boat Vents: Clamshell, Midget & Locker
Sea-Dog stainless ventilation fittings protect or finish openings in boats, from low-profile clamshell covers to compact midget vents and interior locker-door grilles. Compare the part numbers and intended mounting locations before choosing a cover for a vent hole, wire route or locker.
Choose the vent design for the location
Mini clamshell · 331335-1
A low-profile stamped stainless cover that shields vent, wire or blower-exhaust openings where a taller fitting could interfere with deck movement or lines.
Midget series · 331360-1 / 331370-1 / 331375-1
Three sizes of compact stainless vent covers. The large 331375-1 adds a reinforced rim, intended for more exposed service such as small lockers.
Locker-door grille · 331620-1
A stainless ventilation fitting for an interior locker door, helping air move through enclosed storage compartments.
Choose by actual opening
Outside cover dimensions and fastener patterns are not automatically the cutout size. Compare the correct manufacturer drawing and existing opening before drilling.
Sea-Dog marine vent cover comparison
| MPN | Style | Construction | Typical purpose |
|---|---|---|---|
| 331335-1 | Miniature clamshell cover | Stamped 304 stainless | Low-profile shield for ventilation, wiring or blower-exhaust openings |
| 331360-1 | Small midget vent | Stamped 304 stainless | Small vent or cable-entry cover |
| 331370-1 | Medium midget vent | Stamped 304 stainless | Medium-sized vent or cable-entry cover |
| 331375-1 | Heavy-duty large midget vent | Stamped 304 stainless | Reinforced-rim cover for small locker ventilation |
| 331620-1 | Locker-door vent | Stamped 304 stainless | Allows air circulation through interior locker doors |
Before installing a vent cover
- Identify the purpose of the opening: splash protection for a ventilation hole, a wire passage or airflow through an interior locker door.
- Match the manufacturer's exact outside dimensions, opening requirements and screw spacing; do not substitute a midget vent for a clamshell based only on metal finish.
- Orient splash-protective covers in accordance with the manufacturer's intended installation and allow water to drain safely away.
- Use corrosion-resistant fasteners, appropriate backing and suitable sealing for exposed deck or hull penetrations.
- Check any ventilation requirements for the compartment. These covers are not substitutes for approved fuel-tank vents or a correctly designed engine-space ventilation system.
Different ventilation applications: A stainless cover is not a complete ventilation system. Confirm the opening area, required airflow, mounting surface and any relevant marine safety standard for the intended installation.
Sea-Dog stainless ventilation fittings
Choose the exact manufacturer number to see the product and availability.
Related marine installation references
For adjacent deck accessories, see our Sea-Dog fishing rod-holder mount comparison and Sea-Dog screw-out deck plate guide.
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