Attwood Marine 90 Degree Thru-Hull Connector, White Polypropylene, Above-Waterline

Overview

The Attwood Marine 90 Degree Thru-Hull Connector is a white plastic elbow fitting for above-the-waterline marine drain and overflow plumbing where a straight thru-hull would put the hose in a hard bend. Its 90 degree outlet helps route hose cleanly in tight spaces such as livewell overflow drains, baitwell drains, cockpit drain layouts, and other small-boat plumbing runs that need a low-profile turn at the hull.

The fitting is made from white polypropylene and is available for two hose sizes: 3/4" inner diameter and 1-1/8" inner diameter. The smaller version uses a 1" installation hole and supports hull thickness up to 1", while the larger version uses a 1-5/16" installation hole and supports hull thickness up to 1-7/8".

Key features

• 90 degree thru-hull layout helps the hose make a tight turn without kinking behind the hull surface.
• White polypropylene construction will not rust and is suited to above-the-waterline marine plumbing installations.
• Commonly used for livewell overflow drains and similar drain or overflow runs where space behind the hull is limited.
• Available in 3/4" and 1-1/8" inner diameter configurations to match different hose sizes.
• Angled outlet supports cleaner hose routing in lockers, transoms, splash wells, and confined plumbing spaces.

Variants

This thru-hull connector is offered in two size configurations for different hose inner diameters.

The 90 degree form, white color, polypropylene construction, and above-the-waterline use remain consistent across the two options. The hose size, installation hole size, flange diameter, hull thickness capacity, and drain plug size vary by part number.

• 3877-3: Inner diameter 3/4". This size fits 3/4" I.D. hose and uses a 1" installation hole, with a 1-1/2" flange diameter, 1" maximum hull thickness, and 1/2" drain plug size.
• 3879-3: Inner diameter 1-1/8". This larger size fits drain or overflow runs that call for 1-1/8" I.D. hose and uses a 1-5/16" installation hole, with a 2-7/16" flange diameter, 1-7/8" maximum hull thickness, and 7/8" drain plug size.

Installation and fit

Match the selected variant to the hose inner diameter already used in the drain or overflow run. The hose should sit squarely on the barb without forcing a smaller hose over the fitting or leaving a larger hose loose on the outlet.

Before cutting or replacing an existing fitting, check the hull thickness at the mounting point and confirm that the installation hole size matches the selected connector. This is especially important on cored hull sections, liners, transom wells, and molded livewell areas where the available thickness may differ from what is visible at the surface.

Use on board

This fitting is a practical match for small-boat plumbing jobs where the hose needs to turn immediately after passing through the hull side or livewell wall. It is most useful in tight compartments where a straight thru-hull would force the hose into a sharp bend.

Plastic thru-hull connectors of this type are for above-the-waterline installations. For underwater fittings, seacocks, or continuously submerged plumbing, use hardware rated for that specific location and follow the vessel builder’s plumbing layout.

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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