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Attwood Marine 3878-3 Polypropylene Double Ended Thru-Hull Connection for 3/4" Hose

Manufacturer

Attwood Marine

<h3>About Attwood Marine</h3><p><strong>Attwood Marine</strong> has been a cornerstone of the boating world for well over a century. <a href="/7239-attwood-marine">Founded in 1893</a>, the company began by manufacturing precision underwater hardware and on-deck fittings — rudders, struts, cleats, and lights — and quickly earned a reputation for fine engineering and enduring quality. After World War I, the brand's craftsmanship was so well regarded that legendary boatbuilder Chris-Craft turned to Attwood for brass fittings on their iconic pleasure boats.</p><p>Today, Attwood operates as part of the Navico Group by Brunswick, a global family of industry-leading marine companies, yet it has never lost the boater-first focus that built its name. What distinguishes Attwood from many competitors is their end-to-end philosophy: they design, manufacture, test, and distribute their own products rather than simply sourcing components from third parties. Every item in the Attwood catalog is rigorously tested to meet or exceed U.S. Coast Guard (USCG), American Boat and Yacht Council (ABYC), and CE standards — giving boaters and OEM manufacturers alike the confidence to rely on Attwood gear season after season.</p><h3>A Complete Marine Accessories Ecosystem</h3><p>Attwood's catalog spans an impressively broad range of marine needs. On the comfort and ergonomics side, their <a href="/7239-attwood-marine-seat-pedestal-packages-200926">Seat &amp; Pedestal Packages</a> deliver complete, ready-to-install seating system solutions backed by decades of engineering refinement. For boaters who prefer to build or customize their setup, Attwood's <a href="/200999-pedestals-fixed-mount-attwood-marine-7239">Fixed Mount Pedestals</a> provide a sturdy, reliable foundation engineered for lasting stability on the water.</p><p>When it comes to protecting your hull at the dock, Attwood's <a href="/7239-attwood-marine-fenders-200396">Fenders</a> offer dependable, marine-grade cushioning against docks, pilings, and other vessels — an often-overlooked but essential piece of gear for every boat owner. Getting on and off the boat safely is equally important, and Attwood's <a href="/200179-boarding-ladders-attwood-marine-7239">Boarding Ladders</a> are designed with heavy-duty construction, rated hardware, and user-friendly features to make every entry and exit as secure as possible.</p><p>Beyond these categories, Attwood is also widely recognized for its bilge and aerator pumps, navigation lighting, fuel systems, rod holders, and trailering accessories — making the brand a true one-stop resource for outfitting or refreshing virtually any powerboat, fishing boat, or recreational vessel.</p><h3>Why Boaters Choose Attwood</h3><ul style="list-style:disc"><li><strong>100+ Years of Proven Experience</strong> — A heritage of quality engineering stretching back to 1893.</li><li><strong>Multi-Standard Compliance</strong> — Products tested to USCG, ABYC, and CE standards for safety and performance.</li><li><strong>OEM-Trusted</strong> — A leading supplier to major boat manufacturers across a wide range of product categories.</li><li><strong>Corrosion-Resistant Materials</strong> — Extensive use of 304 and 316 stainless steel, chrome-plated zinc, and marine-grade synthetics built for harsh saltwater environments.</li><li><strong>In-House Engineering</strong> — Advanced prototyping, simulation, and real-world testing ensure reliability before any product reaches the water.</li></ul>

Part Number

3878-3
09/19/2036 1:10 PM
Sale Price

$12.59

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Attwood Marine 3878-3 is a double-ended thru-hull connector designed to provide a watertight transition through bulkheads or tank walls. Constructed from durable polypropylene material, this fitting resists corrosion and provides reliable performance in marine environments.

Key Features:

  • Double-ended design for through-bulkhead or through-tank installations
  • Fits 3/4" marine hose
  • 5" overall length provides adequate thickness for most installations
  • Corrosion-resistant polypropylene construction
  • Creates watertight seal when properly installed

Important Installation Note: This thru-hull connector is designed for installation above the water line only. Not for below-waterline applications.

Ideal for livewell systems, baitwell plumbing, washdown systems, and other above-waterline marine plumbing applications where a watertight bulkhead penetration is required.

Products specifications

Dimensions

3/4" Hose Inner DiameterMax Hull Thickness 1 1/8"

Type

Thru-Hull Fittings

Excellent service and fast shipping. A seller I would do business with again.

Everything is super easy. A phone app would be nice, but this still works too

Shipping time sucks ass...... I ordered on Monday and I was told it ships 24 business hours after order. The item shipped late 3 day and will not receive my item until Wendsday a week and two days later talk about snail mail!!!!!! N

Cheaper than summitracing for arp headbolts. Fast processing and shipping.

Awesome experience! Lowest price and product was shipped right away.

Great

Great selection

First time like it so far

Did not receive a confirmation email when I placed the order so I was unsure if if the order had gone through properly. Part shipped the day after I ordered it. I received three confirmation emails at the that time for some reason. Overall I would say the experience ordering from Autoplicity was excellent and inspired confidence.

so far the experience has been great!

These guys had a great price on the Grote light I needed, they sent it out very fast. Item arrived fast and was well packaged, Great company!

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