Attwood Marine Stainless Steel Scupper Valve, SS316, Neoprene Flap, Mirror Finish

Overview

The Attwood Marine Stainless Steel Scupper Valves is a range of barbed stainless steel scupper valves for cockpit, deck, and transom drain installations above the water line. These fittings combine a polished stainless exterior with an internal scupper flap that helps limit backwash when water pushes back toward the drain outlet.

This range covers 1-1/2 in and 2 in hose sizes, giving boat builders and owners a straightforward way to match the valve to existing drain hose and hull thickness. The bodies use Enhanced 316 stainless steel alloy, and the barbed tail gives room for hose clamps at the connection point.

Key features

• Enhanced 316 stainless steel alloy body for drain outlets exposed to spray, washdowns, and saltwater air.
• Scupper flap uses tough neoprene rubber with a molded V that seats into the grooved body to help reduce backwash.
• Concealed, corrosion-proof fasteners keep the outside face clean and reduce exposed hardware around the drain outlet.
• Barbed tail end leaves room for multiple hose clamps, which is useful where drain hose movement and vibration need a secure connection.
• Channel under the flange helps hold a bead of sealant during installation for a cleaner seal at the hull or transom surface.
• Wrench flats or an end notch give the installer a gripping surface so the fitting can be tightened from inside the hull.
• Intended for installation above the water line only.

Variants

This product is offered in two hose-size configurations for matching different scupper drain runs.

The hose size, thread size, installation hole saw size, and maximum hull thickness change between the two variants. The scupper flap construction, stainless steel valve body, and above-waterline installation requirement remain consistent across these barbed scupper valve models.

• 66553-1: 1-1/2 in hose size. This version uses 1-1/2 in NPSM threads, a 2 in installation hole saw size, and supports up to 3 in maximum hull thickness.
• 66555-1: 2 in hose size. This version uses 2 in NPSM threads, a 2-1/2 in installation hole saw size, and supports up to 2 in maximum hull thickness.

Installation and fit

Match the valve to the inside diameter of the drain hose already on the boat, then confirm the hole saw size and available hull thickness before cutting or replacing an existing fitting. The 1-1/2 in version has a 3 in flange outside diameter and 5-1/2 in total length, while the 2 in version has a 3-5/8 in flange outside diameter and 4-1/2 in total length.

Because this is a scupper valve, placement matters. It belongs in an above-waterline drain outlet where the flap can help with backwash while still allowing deck or cockpit water to leave the boat. The barbed outlet should be paired with hose of the correct size and clamps suitable for the hose and installation environment.

Use on board

These valves are a good match for owners, yards, and builders working on cockpit drains, deck drains, and transom scupper outlets where a stainless exterior is preferred over plastic. They make sense on fishing boats, center consoles, cruisers, and other vessels where drain outlets see spray, sun, and regular washdowns.

Maintenance and care

Rinse the exterior with fresh water after saltwater use and inspect the flap during routine cleaning. A flap that is blocked by debris, marine growth, or hardened residue may not seat cleanly, so keeping the scupper area clear helps the valve drain properly and limit backwash as intended.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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