Attwood Marine Clam Shell Vent, Stainless Steel, Large

Overview

The Attwood Marine 66400-1 is a clam shell vent in stainless steel for larger exterior vent holes and for wire or hose pass-throughs that need splash cover on a boat. It uses 300 series stainless steel and mounts with three holes for #6 fasteners, which gives it a clean fit on exposed exterior surfaces.

This style works well where you want to shield an opening without adding a bulky fitting. The shell profile helps deflect spray and washdown, while the stainless finish suits visible mounting points on hull sides, cockpit liners, transoms, and cabin sides.

Key features

• Large clam shell format for exterior vent holes and for wire or hose openings that need a splash cover
• 300 series stainless steel body for better resistance to corrosion in saltwater use
• Three mounting holes sized for #6 fasteners
• Low-profile cover that keeps the opening protected without taking much space on the mounting surface
• Useful for refit work when replacing worn plastic or stainless clam shell covers on exposed areas of the boat

Installation and fit

Check the size of the opening, the available flat mounting area, and the fastener spacing before drilling or replacing an existing cover. This vent is best installed with the opening facing away from direct spray so the shell can do its job as a splash cover.

For cable or hose pass-through use, make sure the run behind the panel has enough clearance and does not force a tight bend right under the cover. On older boats, it is worth comparing the footprint against the existing hardware because clam shell vents can look similar while using a different mounting pattern.

Use on board

This part suits owners who need a straightforward exterior cover for a vent opening or a small hose or wire exit, especially on center consoles, fishing boats, cruisers, and sailboats where deck and hull hardware is exposed to sun, salt, and vibration. It is a sensible match when you want a stainless finish that blends with other exterior hardware and keeps the installation looking tidy.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.