My Account
Shopping Cart

Sea-Dog Line 520750 3/4-Inch Thru-Hull Fitting

Manufacturer

Sea-Dog Line

<p>For over a century, Sea-Dog Line has stood as a cornerstone of the marine hardware industry, delivering innovative solutions that meet the demanding needs of recreational and commercial boaters. Founded in the early 1920s by entrepreneur Hans "Action" Broson Sneve, the company began with a unique sales approach—showcasing marine hardware aboard a 55-foot cruiser that sailed from Alaska to Mexico. This hands-on philosophy continues to shape Sea-Dog's commitment to producing hardware that performs reliably in the harshest saltwater environments.</p><h3>Industry-Leading Marine Hardware Manufacturing</h3><p>Based in Everett, Washington, Sea-Dog Corporation operates a 75,000-square-foot warehouse stocking over 8 million parts and runs an injection molding facility with 16 machines producing more than 17 million components annually. The company's extensive product line spans anchoring systems, deck hardware, electrical components, plumbing fittings, and lighting solutions—all engineered with marine-grade materials like stainless steel, brass, and UV-resistant polymers. Sea-Dog's recognition as a multiple-time NMDA Supplier of the Year underscores the brand's excellence in both product quality and customer service, while their on-staff ABYC-certified marine technician provides invaluable installation and technical support.</p><h3>Premium Marine Components for Every Vessel</h3><p>Sea-Dog's <a href="/7549-sea-dog-line-windshield-washers-wipers-replacement-motors-201195">windshield washers, wipers, and replacement motors</a> deliver crystal-clear visibility during inclement weather, with both manual and electric options featuring corrosion-resistant stainless steel arms and UV-stable blades designed specifically for marine windshield applications. Their <a href="/7549-sea-dog-line-electric-horns-200351">electric horns</a> include the popular MaxBlast line, which passed rigorous 600-hour salt spray testing while meeting US Coast Guard COLREGS and ABYC standards for audible warning devices. For fuel and water system integrity, Sea-Dog's <a href="/7549-sea-dog-line-deck-fills-200307">deck fills</a> provide secure, leak-free access points constructed from durable stainless steel with snap-in designs that resist corrosion in saltwater environments.</p><p>When maneuvering in low-light conditions, Sea-Dog's <a href="/7549-sea-dog-line-docking-lights-200335">docking lights</a> offer bright LED illumination with minimal power draw, featuring injection-molded housings that withstand impacts and temperature extremes. Proper airflow is essential for preventing moisture buildup below deck, and Sea-Dog's <a href="/7549-sea-dog-line-hose-and-cowl-vents-200534">hose and cowl vents</a> deliver reliable ventilation with low-profile designs that include snap-in deck plates for bilge applications or dorade box compatibility for cabin use. Each product reflects Sea-Dog's century-long dedication to manufacturing hardware that recreational and professional mariners can trust, voyage after voyage.</p>

Part Number

520750
06/21/2036 2:04 PM
Sale Price

$4.93

In Stock (10+)

delivery box

Usually delivered within 2 days

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sea-Dog Line 520750 is a 3/4-inch thru-hull fitting constructed of injection-molded polypropylene, making it ideal for marine applications in saltwater environments. This durable fitting is completely impervious to electrolysis and corrosion, ensuring long-lasting performance in harsh marine conditions.

Key Features:

  • Injection-molded polypropylene construction resists corrosion and electrolysis
  • 3/4-inch NPT threaded fitting for standard hose connections
  • Designed for above-waterline drainage applications
  • Allows water to pass in or out of vessel safely
  • Lightweight and durable marine-grade material
  • Ideal for livewell drains, bait tank overflows, and deck drainage systems

This thru-hull fitting is engineered for use with standard marine hose to create reliable water passage points through your vessel's hull. The polypropylene material provides excellent chemical resistance and will not deteriorate from exposure to saltwater, making it a cost-effective alternative to bronze fittings for above-waterline applications.

easy

So far, so good. Found my part fairly easy and is was half the price of the auto parts stores around me!

east to find. exactly what i need

Fast and easy.

Easy to use website.

Fast and easy

They have the best prices and fast shipping too.

Super easy and quick

Just received my wheel lock. It is exactly as described and came very quickly. Autoplicity has the cheapest price and great service.

ok at first I didn't think it would work it did and iam very pleased

Shopping was easy. I just need the shipping to be fast.

well designed website

Great company!! Cheapest price I could find for an air filter and shipped really fast as well. Thumbs up!

Lightning fast shipping!!! I expected it to be here in 2-3 days, not the next.

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy