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

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.