Includes:

• Rockville Dual Distribution Block: 2 x 0/4GA IN to 4 x 4/8GA OUT
  
• Removable clear top cover
  
• 2 black 0/4GA soft rubber waterproofing caps
  
• 4 black 4/8GA soft rubber waterproofing caps
  
• 2 x 0GA to 4GA input reducers
  
• 4 x 4GA to 8GA output reducers
  
• 6 washers
  
• 1 jumper for input
  
• 2 jumpers for output
  
• 2 jumpers (4-way) to bypass fuses
  
• 2 mounting screws
  
• 6 zip ties
  
• 2 hex keys
  

Description:

The Rockville MDB04 Marine Fused Distribution Block (0/4GA In, 4/8GA Out) is engineered for secure, long-lasting, and watertight multi-amp installations in marine or car audio systems. Housed in a single chassis, it simplifies wiring by supporting both power and ground connections—or bypass power with jumpers—making installations faster and more convenient.  You can use for just power and just ground as well for different styles of distribution. It’s waterproof, corrosion-resistant nickel-plated construction ensures durability in harsh marine environments, while upgraded stretchy rubber caps provide extra-tight, watertight seals at connection points. Cables can be securely fastened to the distribution block using zip ties through the integrated mounting holes.

The black base with a highly transparent frosty cover allows quick visual checks of connections, enhancing reliability. With 2 inputs (0/4GA), 4 outputs (4/8GA), and support for 2 ANL or 4 mini-ANL fuses (not included), plus reducers and jumpers for flexible gauge compatibility, this block delivers a robust, all-in-one solution for secure and efficient power distribution.

Features:

• 2 inputs (1/0 or 4GA)
  
• 4 outputs (4 or 8GA) 
  
• Fused distribution block supports up to 2 ANL fuses or 4 mini-ANL fuses (fuses not included)
  
• Supports power and ground in one chassis
  
• Waterproof and corrosion-resistant nickel-plated construction for marine use
  
• Includes jumpers for distribution flexibility
  
• Soft rubber caps waterproofs your connection points
  
• Reducers for compatibility with various wire gauges
  
• Black base with durable frosty transparent cover gives you visibility to see your connections
  
• Wires can be secured with built in zip tie holes
  
• Fuse screws take 5mm and 3mm Allen keys to secure
  

Multiple Applications:

• Two Amplifiers (Power and Ground): One power input and one ground input, two mini-ANL fuses with jumper, and two power outputs plus two ground outputs.
  
• Two Amplifiers (Power Only): Single power input with jumper, two ANL fuses, and two power outputs.
  
• Three Amplifiers (Power Only): Single power input with jumper, one ANL fuse plus two mini-ANL fuses, and three power outputs.
  
• Four Amplifiers (Power Only): Single power input with jumper, four mini-ANL fuses, and four power outputs.
  
• 2, 3, or 4 Amplifiers (Ground Only): Single ground input with jumper, no fuses required, and two, three, or four ground outputs based on configuration