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Sea-Dog Line 4420421 G4 to BA15D Bayonet Base Light Bulb Adapter

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

4420421
06/01/2036 3:35 AM
Sale Price

$6.85

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Sea-Dog Line 4420421 is a precision-engineered bulb adapter that converts G4 bi-pin halogen bulbs for use in standard marine lighting fixtures. Constructed from nickel-plated brass for superior corrosion resistance in harsh marine environments, this adapter allows you to use modern G4 style bulbs in traditional BA15D double contact bayonet base sockets.

Key Features:

  • Converts G4 bi-pin halogen bulbs to BA15D double contact bayonet base
  • Nickel-plated brass construction resists corrosion and oxidation
  • Compatible with standard marine light sockets
  • Enables bulb upgrades without replacing entire light fixtures
  • Reliable electrical contact through dual contact bayonet design

This adapter is ideal for boat owners looking to upgrade cabin lights, navigation lights, or other marine lighting systems to use readily available G4 halogen bulbs while maintaining compatibility with existing BA15D socket fixtures. The durable nickel plating ensures long-lasting performance in saltwater and freshwater applications.

Products specifications

Type

BA15D

great

good price and service

Great price, lowest shipping

Phone service needs some work. Got disconnected many times.

No complaints, Best price, fast shipping, very good communication along all process.<br>Thanks.

Autoplicity was the least expensive and had great response time in regards to shipping. I will use Autoplicity next time I am needing automotive parts. Thanks

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