Briggs & Stratton 595606

Briggs & Stratton 595606 Intake Manifold (Updated Design – Green O-Ring)

The Briggs & Stratton 595606 intake manifold is the updated OEM replacement for earlier plastic intake designs that used red o-ring seals (OEM part number 591784).

Briggs redesigned this intake to address common issues with the original red o-ring configuration. While the red o-rings themselves are known to fail, another common issue is that the plastic intake body can warp or crack at the molded seams, leading to vacuum leaks.

The updated 595606 design features green o-ring seals for improved sealing, helping reduce these issues while maintaining the original OEM configuration.

Why Choose the Updated 595606 Intake?

✔ Direct OEM replacement for red o-ring intake (591784)
✔ Improved sealing design with updated green o-rings
✔ Helps reduce vacuum leaks caused by o-ring deterioration
✔ Maintains factory fit and configuration — no modifications needed

Common Issues with the Original Design

Engines equipped with the earlier red o-ring intake (591784) may experience:

• Hard starting
• Surging or uneven idle
• Lean running conditions
• Loss of power

These issues can be caused by failing o-rings and/or cracks or warping in the plastic intake housing, both of which can lead to air leaks.

Fitment Notes

• Fits select Briggs & Stratton V-Twin engines with dual-barrel carburetors
• Direct replacement for intake manifold 591784 (red o-ring design)
• Always verify your engine model number for proper fitment

When to Choose This vs. Metal Intake

• Choose 595606 if you want:
  ✔ OEM-correct replacement
  ✔ Updated factory design with improved sealing
  ✔ Direct bolt-on solution
• Consider the metal intake (797503) if you want:
  ✔ Maximum durability
  ✔ A long-term solution that eliminates plastic warping and cracking concerns